When analyzing supply curves, the arrow that best shows an increase in supply is W.
An increase in supply is represented by a rightward shift of the supply curve. This shift indicates that at each price level, a greater quantity of the good or service is supplied. In the context of the question, arrow W typically points to the right, symbolizing this increase.
Understanding supply shifts is crucial in economics as it helps in predicting changes in market equilibrium, prices, and quantities. An increase in supply can be caused by factors such as technological advancements, a decrease in production costs, or an increase in the number of suppliers.