Still poor man tool theory intact.
At that time, US company found it hard to compete against like Sony, Toyota, Panasonic, hence need to low currency to compete.
While there were plenty of political issue involved as well, which needless to talk into it further as get derailed from financial topic.
Fundamentally, there is nothing good or proud about championing with lower currency.
When you constantly and repeating need lower currency to compete, it just means the economy doesn't step up.
Just like cheapo phone vs Iphone example I given.
You can use cheapo phone (lower currency) as start up, kick start, but as time goes, you need to value added making premium phone that people want instead continously relying on people want to buy from you just because you are cheaper.
Economy growth is about improve people income and purchasing power, this is the ultimate goal.
Central banks can build up billion or trillion of foreign currency reserves, but people income and purchasing doesn't increase, then the economy growth doesn't yield much meaningful result.
Just like Japan, it has trillion of foreign currency reserves, but economy is stagnant, then the reserves is not much meaningful to its people and economy as a whole.
Same with China, that's why they allow their currency to rise steadily (which they can resist if they wish to, if based on reason of championing low currency) as this is one of the way to improve their people purchasing power and become a stronger economy.
So you admit that the US also had to rely on weaker currency to compete.
When your competitors are more or less as competitive as you, example: Japan and South Korea, and suddenly your currency goes up 20%. Would that be a problem or not?
If the US dollar appreciates 1000% against other currencies, Apple also have to close shop or move to other countries lah. How many idiots do you think would buy the iphone at RM30,000?
Purchasing power is definitely important, but of more importance is economic growth and jobs. Do you want to have a strong currency but a negative growth rate like Brunei?