The difference between the income and the total income has been realized In the early 20th century, famous American economist elvin fisher developed the theory of economic gain. In its book "the nature of capital and yield", first, the concept of yield is analyzed in terms of the performance of earnings, and three different types of benefits are proposed: Many simple ones that you can start with are painting. Painting can come in a lot of forms. For the really children, they're going to love fingerpainting. Older children will like experimenting with tempra paints. Watercolors make the perfect fit for all ages as they can challenge the advanced artist and so are safe for even the toddlers. Gas vehicles mainly include liquefied petroleum gas vehicles (LPG vehicles or LPGV) and compressed natural gas vehicles (CNG cars or CNGV). As the name suggests, LPG cars are fueled by liquefied petroleum gas (LPG) and CNG is powered by compressed natural gas. The CO emission of gas vehicles is more than 90 percent less than the gasoline car, the hydrocarbon emission reduction is more than 70 percent, and the nitrogen and oxygen emission reduction is more than 35 percent, which is the current relatively practical low emission vehicle. It said the budget crunch was necessary to undermine Britain's fiscal position in the wake of the 2008 financial crisis. But the fund questioned whether the fiscal sector No one is a fool, and money doesn't make a profit. Yu 'ebao's interest rate cut is also to avoid risk.