Uber's bezzle destroyed local taxis and local transit - and replaced them with *worse* taxis that cost more.
Uber won't say why its margins are improving, but it can't be coming from scale. Before the pandemic, Uber had *far* more rides, and *worse* margins. Uber has *diseconomies* of scale: when you lose money on every ride, adding more rides increases your losses, not your profits.
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