horticulture oil Hybrid cars, which add an internal combustion engine to pure electric vehicles, aim to reduce the pollution of cars and improve the mileage of pure electric vehicles. Hybrid vehicles have serial and parallel structure. According to this model, the interest rate decision depends on the supply of savings and investment needs, money supply, money demand, four factors, cause a change in the saving investment, money supply and demand factors will affect the level of interest rates. This theory is characterized by general equilibrium analysis. Gender pay gap widening for women in their 20s, data shows Similarly, while Mr Trump's rhetoric on immigration is intense, his policy is relatively moderate, probably because many businessmen who support his campaign do prefer a moderate approach. The "Muslim ban" does not affect America's Labour supply. Although the pace of deportation has accelerated under Mr Trump, it is worth mentioning that millions of undocumented immigrants have also been deported by Mr Obama. The border wall that Mr Trump has forced Mexico to pay remains a dream of no capital. Even if the government plans to favor skilled workers, it will not necessarily reduce the number of legal immigrants. Under the theoretical framework of the theory, the theory of commodity market equilibrium and the monetary market equilibrium of Keynesian theory are unified. Marx's theory of interest rate decisions from the perspective of the source and essence of interest, taking into account the institutional factors in the role of interest rate decisions of interest theory, its theoretical core is the interest rate is determined by the average profit margin. Marx believed that under capitalism, interest is a part of profit and a form of conversion of surplus value.