The growth decays geometrically: https://en.bitcoin.it/wiki/Controlled_supply https://en.bitcoin.it/wiki/Controlled_supply. 18 million BTC in circulation will b

The growth decays geometrically: https://en.bitcoin.it/wiki/Controlled_supply https://en.bitcoin.it/wiki/Controlled_supply. 18 million BTC in circulation will be reached in 2020. Deflation doesn't necessarily mean the currency supply doesn't grow at all, but that it grows more slowly than demand for the currency.