Solution: as long as the gasoline in the tank is exhausted, the extra gasoline vapor in the tank can be fired into the cylinder by the negative pressure of the engine, and no gasoline vapor will overflow. Some western economists believe that enterprises as an organizational form of production are, in part, an alternative to the market. 3. The inseparability of shares, that is, shares are the most basic unit of the company's capital, and each share must not be divided; (3) monetary benefits -- increase the monetary value of assets. There are both measurable and unquantifiable benefits in these three different forms of income. Among them: mental income is too strong to measure, monetary gain is easy to measure because of the static concept of value change. Economists, therefore, focus only on actual earnings. India's top tax authority is expanding its probe into bitcoin investments and transactions, and last week visited at least nine bitcoin exchanges across the country. At that time, there have been reports, tax authorities suspect there is tax evasion in this field, has started "investigation", in order to make clear the status of investors and traders and trading, the related bank account holder's identity and other details.