Final answer:
The increase in computer sales at lower prices is most likely due to an increase in supply, shown by a rightward shift of the supply curve in a demand and supply diagram, indicating greater availability at lower prices.
Step-by-step explanation:
The recent trend in the computer market towards higher sales at lower prices can be explained by a shift in supply. A likely cause for this outcome would be technological advances, production efficiency improvements, or a decrease in input costs, which can increase the overall supply of computers.
When we draw a demand and supply diagram, an increase in supply is represented by a shift of the supply curve to the right. Holding demand constant, the increased supply would lead to a lower equilibrium price and a higher equilibrium quantity, explaining the scenario of more computers sold at lower prices.
On the other hand, a rise in demand, indicated by a rightward shift of the demand curve, would typically increase prices along with the quantity sold. Since the question mentions lower prices, a rise in demand alone isn't a reasonable explanation. However, if both demand and supply increase, the final effect on price would depend on the relative shifts of both curves.
A price floor affects the market by setting a legal minimum price and does not directly shift the demand or supply curve. Instead, it can create a surplus if set above the equilibrium price.