technically wrong, from wiki :"In economics, inflation is a sustained increase in the general price level of goods and services in an economy over a period of time.[1]
When the price level rises, each unit of currency buys fewer goods and services. Consequently, inflation reflects a reduction in the purchasing power per unit of money"
What makes itself an investment is the sustained increase in the general exchange rate fiat/btc, which is sometimes higher than mining itself (for example). In the long term, making money with "this" money is very very interesting (i think actually better than gold)