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Then how do you explain Dash, with an inflation of 13%/year?

Better marketing.

So it's possible.

I was joking.
Dash Coin is mined. Steem is not. Steem is created automatically.

Doesn't matter. Both coin emissions are set rates. Steem uses a set rate defined by code while Dash uses a set rate defined by code in conjunction with the hashrate and network difficulty.

There is no functional difference from the standpoint of new coins entering the economy.