If you are interested in how Apple brought the PowerBook to market, and how it reigned supreme from 1991 until 1995, you might want to read this article from Low End Mac.
John Sculley was still very squeamish about portable computers. He did not want to invest money into what could be a flop like the Portable, so he gave Selvin an allowance of only $1 million, compared to tens of millions often afforded other project….
Because of shortages, customers were faced with a six month wait for their computer.
In the first year on the market, PowerBooks generated over $1 billion in sales, and dethroned Compaq and Toshiba in the portable market.