The 'laws' of economics are based on supply and demand.
The effects of migration and trade are based on a slew of factors, including supply/demand for labour in both the host country and the home country, wages, benefits in both countries, etc... Trade effects depend a lot on tariffs, costs in countries on each side of the trade, and those in turn are largely the effect of supply/demand both for goods and labour in countries on both sides of the trade.
The effects of migration and trade are based on a slew of factors, including supply/demand for labour in both the host country and the home country, wages, benefits in both countries, etc... Trade effects depend a lot on tariffs, costs in countries on each side of the trade, and those in turn are largely the effect of supply/demand both for goods and labour in countries on both sides of the trade.