Alcoa had a monopoly in the u. s. aluminum market from the late nineteenth century until the end of world war ii. which barrier to entry was the source of alcoa's monopoly power?

c

explanation:

consider an orange peel: if you want to try and lay it flat, you have to stretch it, we know exactly how things are being stretched or squashed at any given point. we have many different map projections because each has different patterns of some projections can even preserve certain features of the earth without