Generally, when a currency depreciates, that results in higher foreign direct investment. I.e. if the currency of any country depreciates, investing in that country becomes cheaper for foreign companies, e.g. land, equipment or existing facilities are worth less if the investors brings an appreciated foreign currency.
In this specific case, if the yen depreciates, US foreign direct investment in Japan should increase.
It changes over time, depending on the expected rate of return on productive assets exchanged among market participants and people's time preferences for consumption.
Developed countries work on their industrialization more than developing countries by maintaining their industries up to date by introducing all recent techniques that help in growth.
They work on their ca-pita and GDP more as compared to developing countries.
Increase their literacy rate.
Make their infrastructure more and more powerful and up to date.
Develop more revenue by introducing new techniques and creating labs on which they research the feasibility analysis of techniques they can improve.
Make their standards of living more high.
Utilize their resources effectively and efficiently.
Make their birth and death rate as low as possible.
