[s7atic]

You will need to define 'deflationary'. Are you assuming the price of bitcoin (in real goods) will always go up? Why? That would imply an enormous market failure.

The supply of bitcoin will increase until the year 2140 due to block rewards. Afterwards, the supply will be constant (equal to 21M btc).

A sibling comment compares btc to gold. Well, there are a lot more volatile assets than gold (fiat currencies included). The ratio of the price of gold to world GDP has been pretty constant over time, despite the value of gold at times also being derived from various fad uses.