Final answer:
A fall in demand is most likely to explain the lower prices in the computer market.
Step-by-step explanation:
The most likely shift in demand or supply that explains the lower prices in the computer market is a fall in demand.
To explain this on a demand and supply diagram, we can observe that a fall in demand would result in a leftward shift of the demand curve. This shift indicates that consumers are now willing to buy fewer computers at each price level.
As a result, the equilibrium price and quantity would both decrease, leading to lower prices and more computers being sold in the market.