Just look at the size of the market that deals with commodities trading. Every single investor in the world would want a piece of the pie, and he will buy currency from that country. After only a few weeks, value of the currency would have tripled, or more, causing every company which was successfully exporting goods to go bankrupt, causing mass unemployment. The good part being that the people who had money in the bank would enjoy unprecedented purchasing power of cheap imported goods.
Still, in a very small country which would ban currency convertibility, I guess it could work.
Having more import than export is the path to wealth.
If you replace "the country" by "a familly", and "the resources of the country" by "house's furnitures".
Then, as a family, you would prefer a well furnished house (in other words goods imported in it), than an empty house.
Why is it not the same for a country ?
The goal is to have more import than export, without indebt ourselves.
Putting that aside.
The domestic industries also profit of strong currency, since they can buy more productive capacity cheaper.
If they can't sell it, the price of their good will drop until it does (that and the fact that supply goes up). Then buyer aboard will buy the goods, which will lower the value of the currency until equilibrium.
You got nearly all right.
A country and a family want to import exactly as much as it export.
If you export more than you import, you depend on the solvability of the debtors.
If you import more than you export, you depend on your creditors not needing their money back all together earlier than you foresight.
When West Germany had his currency (hardest fiat around for a long time), all other countries needed to buy Marks to buy stuff from West German industries and West Germans found incredibly cheap to go and spend their Marks in countries with weaker currencies like Italy or Greece. In the end, the Import/Export balance of West Germany was always balanced. Do not appear they had any economic problem from having the strongest currency around. A lot of people went to work in Germany from other countries, because they had full employment and needed workers.
The interest rate would raise (a lot higher than the zero or 2% of today) and only very profitable enterprises would be able to get financed. Work intensive sectors (usually in cheap productions) usually have lower margins, so they would receive less investments or none at all where capital intensive sectors would receive more investments. People would save a lot and savers would receive very interesting returns if the lend part of their savings. So you would have people working in highly productive jobs, making more money, saving a lot more and being paid back for their saving loaned.
Bubbles would not form or would be one or two orders of magnitude smaller and rarer. Even better, with more savings, when these bubble would burst, people would not be so severely affected as today (because they would have a lot larger cushion). The economy would grow at a faster rate than today and would have no long recessions.
The only "problem" would be debtors and carefree lenders. The government would not be able to spend so much as it would like (as the politicians and bureaucrats would like). Higher rates of interest would force them to not be indebted and would turn the market against them when the indebtment would go over 20-30% and not 80-100% of the GDP. There would not be enough gold to lend the government so much money at all, in fact. The government would need to revert to taxation, but taxation make people angry and restive. Government would be forced to balance the budget, like it or not. Because it would be forced to pay people in gold coins and it would need to raise them first.