economic profit monopoly It can be seen that shares and shares are the relationship between form and content and cannot be confused. Then the interest rate theory of the loan is the interest rate theory of neoclassical school, which is proposed to correct Keynes's theory of "liquidity preference". In some ways, the theory of interest rate can be regarded as a synthesis of classical interest rate theory and Keynesian theory. But when trump was a populist, he was once a populist, most recently by endorsing the supply-theory tax theory that most republicans still insist on. Mr Trump is also a man running on Washington, dc and on Wall Street. Yet he has piled his government with billionaires (not just millionaires) and Goldman alumni, while making the swamp of business lobbyists more than ever. But the DRAM and NAND semiconductor industries have gone from boom to bust in the face of rising prices and the abundance of falling prices. Will it be any different this time? Or is the need for mobile device memory and disk replacement sufficient to continue to delay the abundance until the foreseeable future? Microsoft's Surface Pro, Surface Laptop, Surface Book and Surface Studio are the main products of Microsoft's Surface series, but there is a clear difference in the share of the devices. The Surface Pro products account for the highest share (79.9%), the Surface Book (7.5%), Surface Laptop (2.0%), and Surface Studio (0.2%).