Answer:
In the simple Keynesian model, inflation becomes a problem only if demand increases at full employment.
Explanation:
In the Keynesian view, price inflation is mainly the result of relative changes in supply and demand, which lead to price changes. Changes in the money supply have no direct influence here. According to this school, the money supply is the result of money creation by the banking system; but this plays only a limited role in the process.
In this vision, a distinction is made between:
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Demand inflation: Inflation occurs when the aggregated demand for goods and services increases, with an initially constant supply.
-Cost inflation: Inflation occurs if there is a sudden decrease in supply when demand remains the same.
The gradual decrease in the value of natural resource is called depletion. The deplection expense is calculated on the cost net off salvage value.

Therefore, Depletion expense per ton of ore would be $0.64 per ton of ore.
Demand is the quantity of a good or service for which a consumer is willing to buy and a company is willing to sell at a given price at a specific time. For the entire market, the demands for the buyers are summed to find the market demand.
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