Table of Content
1 Industrial Chain Overview
    1.1 Electric Bus / Coach Industry
        1.1.1 Overview
                Figure Electric Bus / Coach Picture List
        1.1.2 Characteristics of Electric Bus / Coach
    1.2 Upstream
        1.2.1 Major Materials
        1.2.2 Manufacturing Overview
    1.3 Product List By Type
        1.3.1 Full Battery Electric Buses (BEB)
        1.3.2 Hybrid Electric Buses (HEB)
        1.3.3 Fuel Cell Electric Buses (FCEB)
    1.4 End-Use List
        1.4.1 Demand in Bus
        1.4.2 Demand in School Bus
        1.4.3 Demand in Tourism
        1.4.4 Demand in Others
    1.5 Global Market Overview
        1.5.1 Global Market Size and Forecast, 2017-2027
                Figure Global Market Size and Forecast with Growth Rate, 2017-2027
        1.5.2 Global Market Size and Forecast by Geography with CAGR, 2017-2027
                Table Global Market Size and Forecast by Geography with Growth Rate, 2017-2027
        1.5.3 Global Market Size and Forecast by Product Type with CAGR, 2017-2027
                Table Global Market Size and Forecast by Type with Growth Rate, 2017-2027
        1.5.4 Global Market Size and Forecast by End-Use with CAGR, 2017-2027
                Table Global Market Size and Forecast by End-Use with Growth Rate, 2017-2027
2 Global Production & Consumption by Geography
    2.1 Global Production & Consumption
        2.1.1 Global Production
                Figure Global Production Volume Status and Growth Rate, 2017-2021, in Volume
                Table Global Production Volume Status and Growth Rate by Geography, 2017-2021, in Volume
                Figure Global Production Amount Status and Growth Rate, 2017-2021, in Million USD
                Table Global Production Amount Status and Growth Rate by Geography, 2017-2021, in Million USD
        2.1.2 Global Consumption
                Figure Global Market Volume and Growth Rate, 2017-2021, in Volume
                Table Global Market Volume and Growth Rate by Geography, 2017-2021, in Volume
                Figure Global Market Amount and Growth Rate, 2017-2021, in Million USD
                Table Global Market Amount and Growth Rate by Geography, 2017-2021, in Million USD
    2.2 Geographic Production & Consumption
        2.2.1 Production
            2.2.1.1 Asia-Pacific
                Figure Asia-Pacific Production Volume Status and Growth Rate, 2017-2021, in Volume
                Table Asia-Pacific Production Volume Status and Growth Rate by Region, 2017-2021, in Volume
                Figure Asia-Pacific Production Amount Status and Growth Rate, 2017-2021, in Million USD
                Table Asia-Pacific Production Amount Status and Growth Rate by Region, 2017-2021, in Million USD
            2.2.1.2 North America
                Figure North America Production Volume Status and Growth Rate, 2017-2021, in Volume
                Table North America Production Volume Status and Growth Rate by Region, 2017-2021, in Volume
                Figure North America Production Amount Status and Growth Rate, 2017-2021, in Million USD
                Table North America Production Amount Status and Growth Rate by Region, 2017-2021, in Million USD
            2.2.1.3 South America
                Figure South America Production Volume Status and Growth Rate, 2017-2021, in Volume
                Table South America Production Volume Status and Growth Rate by Region, 2017-2021, in Volume
                Figure South America Production Amount Status and Growth Rate, 2017-2021, in Million USD
                Table South America Production Amount Status and Growth Rate by Region, 2017-2021, in Million USD
            2.2.1.4 Europe
                Figure Europe Production Volume Status and Growth Rate, 2017-2021, in Volume
                Table Europe Production Volume Status and Growth Rate by Region, 2017-2021, in Volume
                Figure Europe Production Amount Status and Growth Rate, 2017-2021, in Million USD
                Table Europe Production Amount Status and Growth Rate by Region, 2017-2021, in Million USD
            2.2.1.5 Middle East & Africa
                Figure Middle East & Africa Production Volume Status and Growth Rate, 2017-2021, in Volume
                Table Middle East & Africa Production Volume Status and Growth Rate by Region, 2017-2021, in Volume
                Figure Middle East & Africa Production Amount Status and Growth Rate, 2017-2021, in Million USD
                Table Middle East & Africa Production Amount Status and Growth Rate by Region, 2017-2021, in Million USD
        2.2.2 Consumption
            2.2.2.1 Asia-Pacific
                Figure Asia-Pacific Market Volume and Growth Rate, 2017-2021, in Volume
                Table Asia-Pacific Market Volume and Growth Rate by Region, 2017-2021, in Volume
                Figure Asia-Pacific Market Amount and Growth Rate, 2017-2021, in Million USD
                Table Asia-Pacific Market Amount and Growth Rate by Region, 2017-2021, in Million USD
            2.2.2.2 North America
                Figure North America Market Volume and Growth Rate, 2017-2021, in Volume
                Table North America Market Volume and Growth Rate by Region, 2017-2021, in Volume
                Figure North America Market Amount and Growth Rate, 2017-2021, in Million USD
                Table North America Market Amount and Growth Rate by Region, 2017-2021, in Million USD
            2.2.2.3 South America
                Figure South America Market Volume and Growth Rate, 2017-2021, in Volume
                Table South America Market Volume and Growth Rate by Region, 2017-2021, in Volume
                Figure South America Market Amount and Growth Rate, 2017-2021, in Million USD
                Table South America Market Amount and Growth Rate by Region, 2017-2021, in Million USD
            2.2.2.4 Europe
                Figure Europe Market Volume and Growth Rate, 2017-2021, in Volume
                Table Europe Market Volume and Growth Rate by Region, 2017-2021, in Volume
                Figure Europe Market Amount and Growth Rate, 2017-2021, in Million USD
                Table Europe Market Amount and Growth Rate by Region, 2017-2021, in Million USD
            2.2.2.5 Middle East & Africa
                Figure Middle East & Africa Market Volume and Growth Rate, 2017-2021, in Volume
                Table Middle East & Africa Market Volume and Growth Rate by Region, 2017-2021, in Volume
                Figure Middle East & Africa Market Amount and Growth Rate, 2017-2021, in Million USD
                Table Middle East & Africa Market Amount and Growth Rate by Region, 2017-2021, in Million USD
3 Major Manufacturers Introduction
    3.1 Manufacturers Overview
                Table Major Manufacturers Headquarters and Contact Information
                Table Major Manufacturers Capacity List in 2021
    3.2 Manufacturers List
        3.2.1 BYD Overview
                Table BYD Overview List
            3.2.1.1 Product Specifications
            3.2.1.2 Business Data (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Margin)
                Table Electric Bus / Coach Business Operation of BYD (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Gross Margin)
            3.2.1.3 Recent Developments
            3.2.1.4 Future Strategic Planning
        3.2.2 Daimler Overview
                Table Daimler Overview List
            3.2.2.1 Product Specifications
            3.2.2.2 Business Data (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Margin)
                Table Electric Bus / Coach Business Operation of Daimler (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Gross Margin)
            3.2.2.3 Recent Developments
            3.2.2.4 Future Strategic Planning
        3.2.3 Golden Dragon Overview
                Table Golden Dragon Overview List
            3.2.3.1 Product Specifications
            3.2.3.2 Business Data (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Margin)
                Table Electric Bus / Coach Business Operation of Golden Dragon (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Gross Margin)
            3.2.3.3 Recent Developments
            3.2.3.4 Future Strategic Planning
        3.2.4 NFI Group Overview
                Table NFI Group Overview List
            3.2.4.1 Product Specifications
            3.2.4.2 Business Data (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Margin)
                Table Electric Bus / Coach Business Operation of NFI Group (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Gross Margin)
            3.2.4.3 Recent Developments
            3.2.4.4 Future Strategic Planning
        3.2.5 Proterra Overview
                Table Proterra Overview List
            3.2.5.1 Product Specifications
            3.2.5.2 Business Data (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Margin)
                Table Electric Bus / Coach Business Operation of Proterra (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Gross Margin)
            3.2.5.3 Recent Developments
            3.2.5.4 Future Strategic Planning
        3.2.6 VDL Bus & Coach Overview
                Table VDL Bus & Coach Overview List
            3.2.6.1 Product Specifications
            3.2.6.2 Business Data (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Margin)
                Table Electric Bus / Coach Business Operation of VDL Bus & Coach (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Gross Margin)
            3.2.6.3 Recent Developments
            3.2.6.4 Future Strategic Planning
        3.2.7 Volvo AB Overview
                Table Volvo AB Overview List
            3.2.7.1 Product Specifications
            3.2.7.2 Business Data (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Margin)
                Table Electric Bus / Coach Business Operation of Volvo AB (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Gross Margin)
            3.2.7.3 Recent Developments
            3.2.7.4 Future Strategic Planning
        3.2.8 Zhengzhou Yutong Overview
                Table Zhengzhou Yutong Overview List
            3.2.8.1 Product Specifications
            3.2.8.2 Business Data (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Margin)
                Table Electric Bus / Coach Business Operation of Zhengzhou Yutong (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Gross Margin)
            3.2.8.3 Recent Developments
            3.2.8.4 Future Strategic Planning
        3.2.9 Zhongtong Bus & Holding Overview
                Table Zhongtong Bus & Holding Overview List
            3.2.9.1 Product Specifications
            3.2.9.2 Business Data (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Margin)
                Table Electric Bus / Coach Business Operation of Zhongtong Bus & Holding (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Gross Margin)
            3.2.9.3 Recent Developments
            3.2.9.4 Future Strategic Planning
4 Market Competition Pattern
    4.1 Market Size and Sketch
                Figure Global Market Size and Growth Rate, 2017-2021, in Volume
                Figure Global Market Size and Growth Rate, 2017-2021, in Million USD
                Figure Global Competition Sketch Overview
    4.2 Company Market Share
        4.2.1 Global Production by Major Manufacturers
                Table Global Production Volume List by Manufacturers, 2017-2021, in Volume
                Table Global Production Volume Share List by Manufacturers, 2017-2021, in Volume
                Figure Global Production Volume Share by Manufacturers in 2021, in Volume
                Table Global Production Amount List by Manufacturers, 2017-2021, in Million USD
                Table Global Production Amount Share List by Manufacturers, 2017-2021, in Million USD
                Figure Global Production Amount Share by Manufacturers in 2021, in Million USD
        4.2.2 Market Concentration Analysis
    4.3 Market News and Trend
        4.3.1 Merger & Acquisition
        4.3.2 New Product Launch
5 Product Type Segment
    5.1 Global Overview by Product Type Segment
                Table Global Market Status and Growth Rate by Product Type Segment, 2017-2021, in Million USD
                Table Global Market Status and Growth Rate by Product Type Segment 2017-2021, in Volume
    5.2 Segment Subdivision by Product Type
        5.2.1 Market in Full Battery Electric Buses (BEB)
            5.2.1.1 Market Size
                Figure Global Market Amount and Growth Rate in Full Battery Electric Buses (BEB), 2017-2021, in USD Million
                Figure Global Market Amount and Growth Rate in Full Battery Electric Buses (BEB), 2017-2021, in Volume
            5.2.1.2 Situation & Development
        5.2.2 Market in Hybrid Electric Buses (HEB)
            5.2.2.1 Market Size
                Figure Global Market Amount and Growth Rate in Hybrid Electric Buses (HEB), 2017-2021, in USD Million
                Figure Global Market Amount and Growth Rate in Hybrid Electric Buses (HEB), 2017-2021, in Volume
            5.2.2.2 Situation & Development
        5.2.3 Market in Fuel Cell Electric Buses (FCEB)
            5.2.3.1 Market Size
                Figure Global Market Amount and Growth Rate in Fuel Cell Electric Buses (FCEB), 2017-2021, in USD Million
                Figure Global Market Amount and Growth Rate in Fuel Cell Electric Buses (FCEB), 2017-2021, in Volume
            5.2.3.2 Situation & Development
6 End-Use Segment
    6.1 Global Overview by End-Use Segment
                Table Global Market Status and Growth Rate by End-Use Segment, 2017-2021, in Million USD
                Table Global Market Status and Growth Rate by End-Use Segment 2017-2021, in Volume
    6.2 Segment Subdivision
        6.2.1 Market in Bus
            6.2.1.1 Market Size
                Figure Global Market Amount and Growth Rate in Bus, 2017-2021, in USD Million
                Figure Global Market Amount and Growth Rate in Bus, 2017-2021, in Volume
            6.2.1.2 Situation & Development
        6.2.2 Market in School Bus
            6.2.2.1 Market Size
                Figure Global Market Amount and Growth Rate in School Bus, 2017-2021, in USD Million
                Figure Global Market Amount and Growth Rate in School Bus, 2017-2021, in Volume
            6.2.2.2 Situation & Development
        6.2.3 Market in Tourism
            6.2.3.1 Market Size
                Figure Global Market Amount and Growth Rate in Tourism, 2017-2021, in USD Million
                Figure Global Market Amount and Growth Rate in Tourism, 2017-2021, in Volume
            6.2.3.2 Situation & Development
        6.2.4 Market in Others
            6.2.4.1 Market Size
                Figure Global Market Amount and Growth Rate in Others, 2017-2021, in USD Million
                Figure Global Market Amount and Growth Rate in Others, 2017-2021, in Volume
            6.2.4.2 Situation & Development
7 Market Forecast & Trend
    7.1 Regional Forecast
                Table Global Market Forecast by Region Segment 2022-2027, in Million USD
                Table Global Market Forecast by Region Segment 2022-2027, in Volume
    7.2 Consumption Forecast
        7.2.1 Product Type Forecast
                Table Global Market Amount by Product Type Segment 2022-2027, in Million USD
                Table Global Market Volume by Product Type Segment 2022-2027, in Volume
        7.2.2 End-Use Forecast
                Table Global Market Amount by End-Use Segment 2022-2027, in Million USD
                Table Global Market Volume by End-Use Segment 2022-2027, in Volume
    7.3 Investment Trend
    7.4 Consumption Trend
8 Price & Channel
    8.1 Price and Cost
        8.1.1 Price
        8.1.2 Cost
                Figure Cost Component Ratio
    8.2 Channel Segment
9 Market Drivers & Investment Environment
    9.1 Market Drivers
    9.2 Investment Environment
    9.3 Impact of Coronavirus on the Electric Bus / Coach Industry
        9.3.1 Impact on Industry Upstream
        9.3.2 Impact on Industry Downstream
        9.3.3 Impact on Industry Channels
        9.3.4 Impact on Industry Competition
        9.3.5 Impact on Industry Employment
10 Research Conclusion

List of Table
                Table Global Market Size and Forecast by Geography with Growth Rate, 2017-2027
                Table Global Market Size and Forecast by Type with Growth Rate, 2017-2027
                Table Global Market Size and Forecast by End-Use with Growth Rate, 2017-2027
                Table Global Production Volume Status and Growth Rate by Geography, 2017-2021, in Volume
                Table Global Production Amount Status and Growth Rate by Geography, 2017-2021, in Million USD
                Table Global Market Volume and Growth Rate by Geography, 2017-2021, in Volume
                Table Global Market Amount and Growth Rate by Geography, 2017-2021, in Million USD
                Table Asia-Pacific Production Volume Status and Growth Rate by Region, 2017-2021, in Volume
                Table Asia-Pacific Production Amount Status and Growth Rate by Region, 2017-2021, in Million USD
                Table North America Production Volume Status and Growth Rate by Region, 2017-2021, in Volume
                Table North America Production Amount Status and Growth Rate by Region, 2017-2021, in Million USD
                Table South America Production Volume Status and Growth Rate by Region, 2017-2021, in Volume
                Table South America Production Amount Status and Growth Rate by Region, 2017-2021, in Million USD
                Table Europe Production Volume Status and Growth Rate by Region, 2017-2021, in Volume
                Table Europe Production Amount Status and Growth Rate by Region, 2017-2021, in Million USD
                Table Middle East & Africa Production Volume Status and Growth Rate by Region, 2017-2021, in Volume
                Table Middle East & Africa Production Amount Status and Growth Rate by Region, 2017-2021, in Million USD
                Table Asia-Pacific Market Volume and Growth Rate by Region, 2017-2021, in Volume
                Table Asia-Pacific Market Amount and Growth Rate by Region, 2017-2021, in Million USD
                Table North America Market Volume and Growth Rate by Region, 2017-2021, in Volume
                Table North America Market Amount and Growth Rate by Region, 2017-2021, in Million USD
                Table South America Market Volume and Growth Rate by Region, 2017-2021, in Volume
                Table South America Market Amount and Growth Rate by Region, 2017-2021, in Million USD
                Table Europe Market Volume and Growth Rate by Region, 2017-2021, in Volume
                Table Europe Market Amount and Growth Rate by Region, 2017-2021, in Million USD
                Table Middle East & Africa Market Volume and Growth Rate by Region, 2017-2021, in Volume
                Table Middle East & Africa Market Amount and Growth Rate by Region, 2017-2021, in Million USD
                Table Major Manufacturers Headquarters and Contact Information
                Table Major Manufacturers Capacity List in 2021
                Table BYD Overview List
                Table Electric Bus / Coach Business Operation of BYD (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Gross Margin)
                Table Daimler Overview List
                Table Electric Bus / Coach Business Operation of Daimler (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Gross Margin)
                Table Golden Dragon Overview List
                Table Electric Bus / Coach Business Operation of Golden Dragon (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Gross Margin)
                Table NFI Group Overview List
                Table Electric Bus / Coach Business Operation of NFI Group (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Gross Margin)
                Table Proterra Overview List
                Table Electric Bus / Coach Business Operation of Proterra (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Gross Margin)
                Table VDL Bus & Coach Overview List
                Table Electric Bus / Coach Business Operation of VDL Bus & Coach (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Gross Margin)
                Table Volvo AB Overview List
                Table Electric Bus / Coach Business Operation of Volvo AB (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Gross Margin)
                Table Zhengzhou Yutong Overview List
                Table Electric Bus / Coach Business Operation of Zhengzhou Yutong (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Gross Margin)
                Table Zhongtong Bus & Holding Overview List
                Table Electric Bus / Coach Business Operation of Zhongtong Bus & Holding (Production Volume (Volume), Production Amount (Million USD), Price, Cost, Gross Margin)
                Table Global Production Volume List by Manufacturers, 2017-2021, in Volume
                Table Global Production Volume Share List by Manufacturers, 2017-2021, in Volume
                Table Global Production Amount List by Manufacturers, 2017-2021, in Million USD
                Table Global Production Amount Share List by Manufacturers, 2017-2021, in Million USD
                Table Global Market Status and Growth Rate by Product Type Segment, 2017-2021, in Million USD
                Table Global Market Status and Growth Rate by Product Type Segment 2017-2021, in Volume
                Table Global Market Status and Growth Rate by End-Use Segment, 2017-2021, in Million USD
                Table Global Market Status and Growth Rate by End-Use Segment 2017-2021, in Volume
                Table Global Market Forecast by Region Segment 2022-2027, in Million USD
                Table Global Market Forecast by Region Segment 2022-2027, in Volume
                Table Global Market Amount by Product Type Segment 2022-2027, in Million USD
                Table Global Market Volume by Product Type Segment 2022-2027, in Volume
                Table Global Market Amount by End-Use Segment 2022-2027, in Million USD
                Table Global Market Volume by End-Use Segment 2022-2027, in Volume

List of Figure
                Figure Electric Bus / Coach Picture List
                Figure Global Market Size and Forecast with Growth Rate, 2017-2027
                Figure Global Production Volume Status and Growth Rate, 2017-2021, in Volume
                Figure Global Production Amount Status and Growth Rate, 2017-2021, in Million USD
                Figure Global Market Volume and Growth Rate, 2017-2021, in Volume
                Figure Global Market Amount and Growth Rate, 2017-2021, in Million USD
                Figure Asia-Pacific Production Volume Status and Growth Rate, 2017-2021, in Volume
                Figure Asia-Pacific Production Amount Status and Growth Rate, 2017-2021, in Million USD
                Figure North America Production Volume Status and Growth Rate, 2017-2021, in Volume
                Figure North America Production Amount Status and Growth Rate, 2017-2021, in Million USD
                Figure South America Production Volume Status and Growth Rate, 2017-2021, in Volume
                Figure South America Production Amount Status and Growth Rate, 2017-2021, in Million USD
                Figure Europe Production Volume Status and Growth Rate, 2017-2021, in Volume
                Figure Europe Production Amount Status and Growth Rate, 2017-2021, in Million USD
                Figure Middle East & Africa Production Volume Status and Growth Rate, 2017-2021, in Volume
                Figure Middle East & Africa Production Amount Status and Growth Rate, 2017-2021, in Million USD
                Figure Asia-Pacific Market Volume and Growth Rate, 2017-2021, in Volume
                Figure Asia-Pacific Market Amount and Growth Rate, 2017-2021, in Million USD
                Figure North America Market Volume and Growth Rate, 2017-2021, in Volume
                Figure North America Market Amount and Growth Rate, 2017-2021, in Million USD
                Figure South America Market Volume and Growth Rate, 2017-2021, in Volume
                Figure South America Market Amount and Growth Rate, 2017-2021, in Million USD
                Figure Europe Market Volume and Growth Rate, 2017-2021, in Volume
                Figure Europe Market Amount and Growth Rate, 2017-2021, in Million USD
                Figure Middle East & Africa Market Volume and Growth Rate, 2017-2021, in Volume
                Figure Middle East & Africa Market Amount and Growth Rate, 2017-2021, in Million USD
                Figure Global Market Size and Growth Rate, 2017-2021, in Volume
                Figure Global Market Size and Growth Rate, 2017-2021, in Million USD
                Figure Global Competition Sketch Overview
                Figure Global Production Volume Share by Manufacturers in 2021, in Volume
                Figure Global Production Amount Share by Manufacturers in 2021, in Million USD
                Figure Global Market Amount and Growth Rate in Full Battery Electric Buses (BEB), 2017-2021, in USD Million
                Figure Global Market Amount and Growth Rate in Full Battery Electric Buses (BEB), 2017-2021, in Volume
                Figure Global Market Amount and Growth Rate in Hybrid Electric Buses (HEB), 2017-2021, in USD Million
                Figure Global Market Amount and Growth Rate in Hybrid Electric Buses (HEB), 2017-2021, in Volume
                Figure Global Market Amount and Growth Rate in Fuel Cell Electric Buses (FCEB), 2017-2021, in USD Million
                Figure Global Market Amount and Growth Rate in Fuel Cell Electric Buses (FCEB), 2017-2021, in Volume
                Figure Global Market Amount and Growth Rate in Bus, 2017-2021, in USD Million
                Figure Global Market Amount and Growth Rate in Bus, 2017-2021, in Volume
                Figure Global Market Amount and Growth Rate in School Bus, 2017-2021, in USD Million
                Figure Global Market Amount and Growth Rate in School Bus, 2017-2021, in Volume
                Figure Global Market Amount and Growth Rate in Tourism, 2017-2021, in USD Million
                Figure Global Market Amount and Growth Rate in Tourism, 2017-2021, in Volume
                Figure Global Market Amount and Growth Rate in Others, 2017-2021, in USD Million
                Figure Global Market Amount and Growth Rate in Others, 2017-2021, in Volume
                Figure Cost Component Ratio

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