Since "investigation", in more than a week's time, India's tax department has set his sights on the country's 400000-500000 high net worth individuals and found them in Indian currency exchanges. Therefore, several factors make Long Fin a good target for short-term speculation in the market. Newly listed, floating stock plate small, artificial intelligence and blockchain concept. Compared with the Internet boom that preceded the information age, the blockchain era is almost as hot as it was in 1998, and the cryptocurrency world is inviting mainstream participation. 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: Ť he returned to the top five-year bond, because record lows in January has significantly improved, now pay 22 PC more than the beginning of the year. Martin Nettleton adds: “We invested in the campaign to target those larger installation and distribution companies increasingly dissatisfied with the big fabricators who are starting to compete with them by setting up their own networks of trade counters and distribution outlets. 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.