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: 1. Ordinary transport vehicles “Agency workers deserve to be paid the same as employees if they’re doing the same job, so the government should look to close the loophole that allows agency workers to sign away their right to equal pay. In the early hours of Wednesday, crude oil inventories were down (though gasoline inventories rose), boosting U.S. oil prices, according to zero hedge, a leading financial blog. But oil inventories in the EIA fell by five weeks, while gasoline inventories rose in six weeks and oil prices were volatile. In addition, us crude oil output was at a record high. Currently, us oil is trading at $57.56. The oil was trading at $63.95, up 0.25%.