My answer -
An artificial monopoly is a monopoly created by law, for example, the
state makes an arrangement with a specific post service, making it the
main or the only postal service in the country.
A natural
monopoly is a monopoly that is no enforced but which emerges due to high
infrastructure costs, so for example the infrastructure of water supply
makes the company who built the pipes the monopoly.
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The Federal Reserve System, often referred to as the Federal Reserve or simply "the Fed," is the central bank of the United States. It was created by the Congress to provide the nation with a safer, more flexible, and more stable monetary and financial system.
Answer: 72 cents
Explanation:
There will be a margin call when more than $1000 has been lost from the margin account so that the balance in the account is below the maintenance margin level. Because the company is short, each one cent rise in the price leads to a loss or 0.01×50,000 or $500. A greater than 2 cent rise in the futures price will therefore lead to a margin call. The futures price is currently 70 cents. When the price rises above 72 cents there will be a margin call.
price level falls, purchasing power rises effect is the reasons the ad curve is downward slopinging