Are blenders and food processors usually rated in terms of average wattage or peak wattage?

I saw the Ninja blender and food processors were advertised as "peak wattage 1500." Some other blending machines at a similar price range had lower wattage, but most of them did not say "peak." In electrical engineering (my field), there is peak values and other values (such as operating values).

Is it reasonable to assume most blenders and food processors are advertising their peak wattage (and not a lower wattage under load or RMS power)?

I simply want to compare apples to apples when selecting one to buy.