About two-third of the world's wine is produced in Europe. France, Italy, and Spain account for almost half of all the wine produced in the world. Except for France, none of the top 10 wine-producing countries in Europe levy an excise (per-unit) tax on still wine, and France's excise tax is very small (about \(€ 0.038\) per liter). If the wine industry were perfectly competitive, explain what effect a significant excise tax in France would have on the longrun supply curve for wine from those two countries when the entry of firms is limited.