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The price of Steem is not falling because of inflation. The inflation rate is much lower than the actual price drop. It is falling because the incentive to buy Steem as an investment is not big enough among those possible investors who know about Steem. New users aren't hurting the price because they are not the ones who sell Steem. It is much more the opposite. New users are more likely to buy a few Steem to test the buy function and because they think owning a little bit more Steem Power would be cool.
Think about that: It would just need 58 BTC to buy all Steem that are sold on Poloniex for under 10000 Satoshi. If Steemit suddenly gets popular and more new users invest a small amount the price of Steem would go up because of new users.