Economist: In any country, inflation occurs when the money supply grows more than the production of goods and services grows.
Conclusion (Hence)
My country is very unlikely to experience significant inflation or deflation.
Evidence
In any country, inflation occurs when the money supply grows more than production.
Deflation occurs when production grows more than money supply.
In my country, gold anchors the money supply, so the money supply is very stable.
Evaluate
The author is arguing that his country is unlikely to experience much inflation or deflation, and then we're provided with what causes of each of those things.
So we should pause and say to ourselves:
Does he establish that money supply and production will not grow out of proportion with each other?
Nope, he just says that the money supply is stable.
Goal
Since he needs money supply and production to grow in sync with each other, he must be assuming that the production of goods and services in his country is also stable.