That's silly in the US case because the president doesn't even have the power to decide how to spend the money in the treasury much less the accumulated wealth

That's silly in the US case because the president doesn't even have the power to decide how to spend the money in the treasury much less the accumulated wealth of the companies and people... In the case of a dictatorship mixing the wealth of both makes sense at least a bit because they can directly control a lot of it (and are often embezzling the shit out of everything too so they actually 'own' a lot of wealth).