[jrs235]

Prices across the board could increase if say the cost to produce and deliver them went up across the board, perhaps because the cost of energy/oil goes up, perhaps due to constrained supply. This isn't inflation and the price increase isn't due to inflation.

Prices across the board could also go up if war breaks out. That's not inflation.

Those types of price increases are due to the supply side. Inflation is due to the demand side and the available dollars chasing the [same amount of] goods.

Price increases and inflation are not the same thing. They are typically related though.