Let me give you an answer not beholden to populism, but an evolutionary reality. The best way to improve competition is to have none, for both buyers and sellers. Let me explain.
The most optimal marketplaces are the ones that continuously reinvent themselves upstream (based on optimal freedom). A new and better normalization of truth upstream driving premium value, soon to spawn a new delta of downstream evolution, competing on price over value.
So, excessive competition signals not a marketplace operating under the principles of freedom but quite the opposite. Heavy competition is a sign the marketplace has run out of options to differentiate on value, the antithesis of a marketplace driven by the optimal freedom that would otherwise already have reinvented itself in favor of differentiated value.