When economic conditions are more favourable in neighbouring countries, there tends to be a flow of Japanese workers who decide to go overseas to make more money.
この場合、次のような言い方ができますよ。
ーWhen economic conditions are more favourable in neighbouring countries, there tends to be a flow of Japanese workers who decide to go overseas to make more money.
「隣国の経済状況が（自国より）良いと、日本人労働者がお金を稼ぐために海外に流れていく傾向にある」
economic conditions「経済状況」
to go overseas to make more money で「お金を稼ぐために海外に行く」
ご参考まで！
カナダ 
