Core Loss, Copper Loss, Inductive Loss?

hey thank you guys for teaching me how to calculate the efficiency of a transformer as

efficiency = (power out)/(power in) = (power out)/((power out) + (copper loss) +(core loss))

which totally makes sense, but now im looking at a text book thats having me involve the self inductance and mutual inductance of the transformer. doesnt that account for some power loss as well?