price to earnings ratio calculation Nowadays, electric vehicles are referred to as pure electric vehicles, namely, a car that USES a single battery as the energy source for energy storage. It USES the battery as the energy source to power the motor, which drives the motor and drives the car forward. In terms of appearance, electric cars are indistinguishable from everyday cars. The difference lies mainly in the power source and the driving system. This two days of U.S. stocks in the capital market, there was a dark horse, the named Longfin company, in just two days, rose more than 2000%, and due to rise too fast, multiple trigger exchange circuit breakers. It is understood that the company is mainly engaged in the use of artificial intelligence technology to provide financial services. Longfin (NASDAQ: LFIN), which was founded in February, has been trading on the NASDAQ stock exchange since last week at $5 a share, a very young start-up. Charlotte Nelson, of Moneyfacts, said: "only 56 providers of SVR went up, seven of which raised their interest rates by less than 0.25 percentage points, resulting in a more modest rise in average SVR. According to data released on Wednesday by the U.S. energy information administration (EIA), the number of commercial crude stocks removed from strategic reserves fell by 649.5 million barrels to 465 million barrels, by 1.5 percent, while the previous value fell by 5.11 million barrels. The investment quantity is the decreasing function of interest rate, saving is the increment function of interest rate, and the change of interest rate depends on the equilibrium point of investment quantity and saving amount. Keynes's theory of money supply and demand decided that interest rates were a monetary factor rather than an actual factor.