As for inflation, it should still be, because without inflation, people will become lazy and do not want to grow anymore. Japan has suffered from deflation for many years and has made the country unable to develop as well.
Not all countries are alike, not all needed inflation to develop, every country have their own uniqueness that makes them different from other. All countries have their different view on development, others focus on building and others on their crops. Inflation should not be treated as a good thing.
Currency and their values changes overtime based on the status of their economy. Physical money or fiats are just a representation of a true value of money.
right, I think every country has its own problems, so it requires different treatment, like in Japan, they don't face the problem of terrorism, so it's different from the countries that face the problem, and also in Japan there is minimal corruption, this is different from many countries corrupt