There will without doubt be improvements in the efficiency of the economy - more output fromless electricity through better machines or ways of doing things or better materials.
Da Vinci helps surgeons perform everything from cardiac bypasses through gastric bypasses with far more precision and less collateral damage than an unaided human.
The potential reward of not only keeping profits already made in a rally, but going after more profits from the subsequent market decline, made buying and holding through whatever comes along even less attractive .
The decision of the Iraqi prime minister, Nuri al-Maliki, more or less to endorse Mr Obama's timetable for withdrawing American troops from Iraq sent shock waves through Washington, DC, discombobulating the White House and driving the McCain campaign into panic.