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Good and tidy explanation on where the money comes from.

The value of the currency is determined by the market, the speculators as mentioned in the video.

Do you believe that at some point Steem will have to accept advertisement to provide some monetary value, or is this likely to be implemented in todays infrastructure where its possbile to gain some "weight" by investing in a profile?

Really interesting video. Very good job :) We need this kind of video to educate the new users.