Demand and Supply: Understanding Money, Inferior Goods, and Market Surplus

i) Money is a medium of exchange that is widely accepted in transactions for goods and services. It's a unit of account, a store of value, and a standard of deferred payment. Money can be in the form of currency, such as coins and banknotes, or it can be in the form of electronic balances in bank accounts.

ii) An inferior good is a product for which demand decreases as consumer income increases. If consumers' income decreases, the demand curve for an inferior good is likely to shift to the right. This means that consumers will demand more of the inferior good at each price level. As a result, the equilibrium price is likely to increase and the equilibrium quantity is likely to decrease. This is because a decrease in income leads consumers to prioritize cheaper alternatives, including inferior goods.

iii) A surplus exists in the market when the quantity supplied exceeds the quantity demanded at a particular price. This occurs when the price is set above the equilibrium price. In such a situation, suppliers are unable to sell all of their products, leading to an accumulation of excess supply or inventory. To address this surplus, suppliers are likely to lower their prices to incentivize consumers to purchase the excess supply. This decrease in prices will continue until the surplus is eliminated and the market reaches a new equilibrium.