Better integration and more free trade is an easy win-win scenario for both sides.
It’s a win-win scenario for wealthy people. Poor people always get screwed in any kind of free trade deal, since prices of goods always rise to the highest possible point in the entire free trade zone.
That is just not true. FTAs lower trade barriers on imported goods, leading to consumer welfare gains from increase in product variety, better quality products and lower prices for existing products.