From control of wealth comes the power to govern.
Therefore the rulers will always be either a warrior elite or a merchant elite.
How then do you have a system that consistently puts a philosopher king in power?
A system that puts governing into the hands of the most capable.
There never has been a meritocracy of governance only the rule of the strong.
The life of the warrior or the merchant demands intense specialization and requires an incurious personality. The rulers most societies have had most of the time reflects these realities.
Plato identified the main problem of politics 2300 years ago, but no one has ever figured out how to reliably implement that basic idea of giving that job to the best qualified.