Can you provide an example of deflation destroying an economy in history? There are many more examples of inflation destroying economies.
Wasn't the great crisis in first half of 20th century caused by deflation?
Japan in living memory, I believe? I'm not a history buff. Google should have many examples.
Are you kidding me? Have you heard of a tiny event called the Great Depression?
The Japanese Lost Decade?
Greece Debt Crisis?
The problems with using physical gold as currency are very well known. When population would increase, or when someone would hoard it, it would cause deflation. Likewise, when a new deposit of gold was found, it would cause inflation.
This is, in part, why there were expeditions to find gold.