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Selling applications has changed. It's not as simple as payments in apps or a higher price to download. What comes next, however, is anything but settled. A promising path is Amazon Underground, a new model that has grown exponentially since its launch a few months ago. For those who do not know Underground - which, realistically, includes most people - the model is incredibly simple, especially for customers. Simply download a game, usually one that costs at least a dollar or two on other platforms, and play for free. There is no initial cost and no upsell in the application. Amazon pays developers, meanwhile, based on how much time people spend using applications. But how much do they pay? And how long do they really spend in them? Amazon threw some light on Underground, and how fast he grew up in a difficult climate. As with its hardware sales, Amazon stock numbers are not absolute. Instead, they are percentages, so it's impossible to tell exactly how the Underground