Thanks in advance!
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I would be interested to hear you try to make the case that the mobile phone market is a competitive one.
Secondly, I'm not saying it is perfectly competitive but given no firm has higher more than 25% of the market, it is unlikely that any one has significant monopoly powers. When I say the mobile phone market it is important to note that I mean for handsets, which is completely separate from their contracts.
I disagree with you less now I know you meant the market for handsets only. None the less, I would personally argue that 3 companies holding 50% of a market with no other big players is extremely far off a competitive market. We will agree to disagree. I take your point about A level just being an understanding of the concepts.