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basis:基差
常见的几个概念有：
- Adjusted basis, the net cost of an asset after adjusting for various tax-related items
- Basis of futures, the value differential between a future and the spot price
- Basis (options), the value differential between a call option and a put option
- Basis point, 0.01%, often used in the context of interest rates
- Basis trading, a trading strategy consisting of the purchase of a security and the sale of a similar security
- Cost basis, in income tax law, the original cost of property adjusted for factors such as depreciation
- Tax basis, cost of an asset
