What are the possible economic impacts of mass emigration from a certain country? Especially if that country is less developed?

Mass emigration from a country can cause brain drain and a lack of innovation.

Explanation:

Mass emigration can be a problem for less developed countries because the best and brightest in their society will seek out opportunities to study abroad and to stay abroad when they establish their careers since there are more opportunities and resources in more developed countries.  People with good engineering skills from India or Pakistan for example might seek opportunities elsewhere because the average salaries for someone with their skills are higher elsewhere. This will have a negative effect potentially on the home society but the most innovative people will seek out better opportunities elsewhere and domestic businesses and industries will not benefit from their know-how and drive. It can also negatively impact the tax base for the state if those people with the most potential to earn and be successful are leaving the country at a steady pace.  

european feudalism was a combination of legal and military customs in medieval europe that flourished between the 9th and 15th centuries. broadly defined, it was a way of structuring society around relationships derived from the holding of land in exchange for service or labour.

japanese feudalism. the era of feudalism in japan took place from the 12th through 19th centuries. during that period local rulers, either powerful families or military warlords, dominated the land, while the emperor was merely a figurehead and not a significant political presence.

it brings together the military and civilian sectors of society to harness the total power of the nation. it is the mechanism that facilitates the successful prosecution of any conflict.it brings together the military and civilian sectors of society to harness the total power of the nation. it is the mechanism that facilitates the successful prosecution of any conflict.