1. The problem describes how an anticipated higher future price affects the current supply of wireless earbuds. 2. When suppliers expect higher future prices, they tend to increase their current supply to the market to benefit from the higher prices later. 3. This increase in current supply causes a rightward shift in the supply curve, from $S_1$ to $S_2$. 4. A rightward shift means at the same price, the quantity supplied increases. 5. Therefore, at the price of 4 per wireless earbud, the quantity supplied rises. Final answer: Suppliers increase their current supply, causing a rightward shift in the supply curve, and the quantity supplied rises at the price of 4.