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！
If the economies of neighboring countries are strong, Japanese workers will move there for better opportunities.
If the economies of neighboring countries are strong, Japanese workers will move there for better opportunities.
When neighboring countries offer better pay, young Japanese workers tend to flock abroad.
「隣国の経済が強いと、日本人労働者はより良い機会を求めてそちらへ移ります」
・neighboring countries「隣国」
地理的に近い国々を指します。
カナダ 
アメリカ合衆国 
