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| Symbol | Description |
|
| Automobile manufacturer product, |
| Alternative levels of products, namely, competition intensity () |
| Production cost of automobile manufacturers |
| The marginal production cost of automobile manufacturers |
| The R&D investment cost of new products |
| The cost reduction caused by technological innovation |
| Coefficient of technology spillover, |
| Technical content of product , |
| Technical content of new products in cooperation development |
| Share of R&D investment undertaken by automobile manufacturer |
| The increased competitive extent caused by cooperative research and development |
| The sensitive coefficient of new products’ technical content, namely, consumption preference for technical content, |
| Basic demand for entire automobile manufacturers, |
| Demand for automobile manufacturers |
| Market price |
| Wholesale price |
| The profit of automobile manufacturer |
| The total profit of automobile manufacturers |
| The profit of automobile dealer |
|
