Market equilibrium occurs at the price point where the quantity demanded by consumers exactly matches the quantity supplied by producers. At this point, there is no tendency for the price to change, as there is neither a surplus nor a shortage of goods in the market.

A price floor is a government- or group-imposed price control or limit on how low a price can be charged for a product. A price floor must be higher than the equilibrium price to be effective, ensuring producers receive a minimum level of income for their goods.

When the government imposes a price floor or ceiling, it disrupts the market's natural clearing mechanism. If a price is fixed below the equilibrium price, it acts as a price ceiling. At this lower price, the quantity demanded by consumers increases while the quantity supplied by producers decreases. This imbalance results in a shortage, which is technically referred to as excess demand, as the market cannot reach its natural equilibrium point.

A household's total purchasing power is derived from both its flow of income (such as wages, interest, or dividends) and its stock of accumulated wealth (such as savings, property, or investments). Both components influence the budget constraint and the ability to consume goods and services over time.

Consumer equilibrium occurs at the point where the budget line is tangent to the highest attainable indifference curve. At this point, the consumer maximizes their utility given their limited income and the market prices of the goods. This tangency ensures that the marginal rate of substitution between the two goods is exactly equal to the ratio of their market prices.

When consumer income rises, purchasing power increases, allowing individuals to buy more goods at any given price. This change in a non-price determinant of demand causes the entire demand curve to shift to the right, reflecting an increase in demand rather than a mere movement along the existing curve.

Sellers often lobby for price floors because these policies prevent the market price from falling below a certain level, thereby guaranteeing higher revenue per unit sold than would exist in a free market equilibrium. Buyers generally oppose price floors as they result in higher prices and potential market surpluses, reducing consumer surplus.

The slope of the budget constraint is calculated as the negative ratio of the price of the good on the horizontal axis to the price of the good on the vertical axis (-Px/Py). Here, the price of pizza (horizontal) is Rs10 and the price of sandwiches (vertical) is Rs5. The absolute value of the slope is 10/5, which equals 2. This represents the opportunity cost of pizza in terms of sandwiches.

When demand increases, consumers are willing to purchase more of a good at every price level. This creates upward pressure on the price as buyers compete for the available supply. As the price rises, producers are incentivized to increase the quantity supplied, resulting in a new equilibrium characterized by both a higher price and a higher quantity of output.

The equilibrium price is the point at which the supply and demand curves intersect. At this specific price, the quantity that producers are willing to supply exactly matches the quantity that consumers are willing to purchase, resulting in market clearing with no excess supply or demand.