Sorry, I deleted my previous response as I wasn't sure it was adding to the discussion - I've added the original text below.

Thanks for the clarification - but how can you be sure that developers would move platforms?

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I'd like to know what your definition of a market and marketplace is.

I'd define a market as a place (or economic 'space') where people sell a related class of products or services.

I'm not defining an iOS or iOS-based device as a market. I'm referring to the market for iOS applications (i.e. the AppStore).

Why is the AppStore not a marketplace?