ONE of the time-honoured tropes of writing on business is the detailed description of the life of a corporate titan. Readers are expected to marvel at the stamina of Tim Cook, for example. Apple’s chief executive rises at 3.45am to deal with emails. Spare a thought for his underlings, whose iPhones buzz at 4am every morning. Some subordinates may have the fortitude to sleep through it all; many will be guilt-tripped into answering the boss. Highly effective people often inflict all their idiosyncrasies upon their hapless juniors…….