World trade should be free basically.

I'll show three reasons below.

  First , free trade promote international trade, thus promoting the growth of the world economy.

While Tokugawa Shogunate ruled the Japan, they closed it up and didn't trade with other countries.

As a result Japan's economy left behind from western countries.

   Second, free trade will expand the international market, thus dramatically increasing job opportunities.

South-east Asian countries were used to be very poor but they have grown because of the capital investment from advanced countries.

  Finally free trade will support countries each other and brings peace.

If world is not safe, people cannot move , work and invest over the seas.

By the reasons I showed above, I believe free trade will be useful for people over the world.