[Tomte]

The number one reason for Switzerland's wealth is that they were clever enough to stay out of wars as much as possible.

Other countries start from ruins and rubble periodically. Switzerland grows its prosperity incrementally, without catastrophes.

[comrade1]

They were lucky to not get invaded by the Germans but they totally expected to be invaded and built a defense strategy based on this belief that lasted until the 1990s.

Twice the Germans started the process of putting together a Swiss invasion and gave up early because they realized they would have lost.