Inflation's Hidden Faces
Inflation has different faces:
When there are government price controls and the monetary supply increases, the demand for goods will increase and the supply will not (because the supply will not react to incentive implicit in the price rise) thus creating scarcity and unsatified demand willing to pay more; which is fertile ground for black markets.
So as you see, inflation can disguise itself as scarcity of goods or as a black market. These are only two of its possible and most visible disguises.
By the way, Inflation is properly defined as a sustained rising in prices, not just a raise in prices. This means that a simple price hike, say caused by a temporary phenomena such as a flood, drought, or a hike in oil prices implies an adjustment in the price level, not necesarrily inflation --- although many people (economists included) --- call it inflation. Inflation is properly when you have a sustained level of price increases, every month, every year, no matter at what level; and it is mostly due to a sustained expansion of the money supply in excess of the demand for money.