iran oil reserves 3. Remove the gasoline pump in the car In the 1920s and 1930s, the great depression forced western economic theorists to reflect on the definition of the market. The final answer is completely laissez faire is not enough, the invisible hand sometimes does not exist, market failure, government should be on economic activity on the "total" intervention, so "macroeconomics" was born. Roosevelt also accepted Keynes's proposal to impose a "New Deal" on government intervention in the economy. It has now formed the world's most consensus-building government: fiscal policy, monetary policy, and, of course, none of these "new" policies. In 1934, professor rei, of the center for fluid mechanics, used model cars to measure the aerodynamic drag of various bodies in wind tunnels The right to promote and protect the free exchange of values between the two parties - the exchange of freedom is crucial to the participation of the future world. It is equivalent to freedom of speech in digital space. This is about equality and must be protected and seen as a human right.