They demonstrably do not. Look at any competitiveness index, or standard of living index, or anything measurable.

The article you’ve linked is banal. It talks about how monarchies are good at protecting established property rights. Duuuuuh. That’s their entire purpose.

Thinking that stability of property rights is equal to economic performance is moronic. So either you think that I am one or you are one.

Here’s a quick test you can do: look around you and count how many items around you are produced in the Kingdom of Lesotho? Or Kuwait? Or Madagascar? Or Bhutan?

Such post-industrial powerhouses of economy those must be.