By causing the changes, manufacture canned tuna because labor costs used to produce higher in America cause to move production bases, canned tuna came to shore, the developing countries that the labor used to produce cheaper.
The cause of the production of canned tuna produced by that labor costs in manufacturing increased in the US, resulting in the production of canned tuna to the developing countries where labor costs. used to produce cheaper
The resulting changes in production base, canned tuna, due to labor costs used in the production of the rise in American side cause relocation canned tuna to the developing countries where labor used in production of cheaper.