Recall, please, the national mood in the mid-’70s: after the 1960s party, we found ourselves in a slough of despondency, with an oil crisis, a terrible recession, a kind of Weimarish embrace of decadence, national malaise — and at that very dispirited moment, Microsoft and Apple were founded. The next transformative, moneymaking technologies and businesses are no doubt coming soon to a garage near you.