Imagine for a moment that networks run on colours instead of using IP addresses. There is an unlimited supply of the colours blue and yellow but the other colours are in short supply. Your network is divided into many users using the colours blue and yellow because they are free to use. The blue users need to get out to the web fairly regularly, so you buy a few green tokens which your router can use to swap for the blue users’ tokens when they need to reach hosts on the web. Your router would be doing this:
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