The literal definition of the word implies a 100% share:
> A monopoly (from Greek μόνος mónos ["alone" or "single"] and πωλεῖν pōleîn ["to sell"]) exists when a specific person or enterprise is the only supplier of a particular commodity. [1]
The legal definition implies a tremendous advantage such that consumers would have no alternatives if the company raised prices:
> courts ask if the firm has "monopoly power" in any market. This requires in-depth study of the products sold by the leading firm, and any alternative products consumers may turn to if the firm attempted to raise prices [2]
I don't think Amazon can raise prices substantially without negatively affecting their market share. Costco, Walmart and Google Express are big enough players that they could handle an increase in volume if Amazon tries to raise prices beyond what the market is willing to bear.
> A monopoly (from Greek μόνος mónos ["alone" or "single"] and πωλεῖν pōleîn ["to sell"]) exists when a specific person or enterprise is the only supplier of a particular commodity. [1]
1. https://en.wikipedia.org/wiki/Monopoly
The legal definition implies a tremendous advantage such that consumers would have no alternatives if the company raised prices:
> courts ask if the firm has "monopoly power" in any market. This requires in-depth study of the products sold by the leading firm, and any alternative products consumers may turn to if the firm attempted to raise prices [2]
2. https://www.ftc.gov/tips-advice/competition-guidance/guide-a...
I don't think Amazon can raise prices substantially without negatively affecting their market share. Costco, Walmart and Google Express are big enough players that they could handle an increase in volume if Amazon tries to raise prices beyond what the market is willing to bear.