This bull market can go on for a bit longer

All bull markets always go on longer than anyone rational thinks they should. This one is no exception, says Merryn Somerset Webb.

Here is a list of things we are pretty sure of. Valuations of almost all assets are expensive by historical standards. The shrinking of central-bank balance sheets matters: if quantitative easing (QE) pushed markets up, quantitative tightening (QT) will surely bring them down. Full employment will eventually lead to inflation. Peak social media something that, alongside Trump's hostility to the likes of Google, has to have implications for the stock prices of the tech darlings is almost upon us. And markets can't ignore politics forever: unrest in Italy, Sweden and Germany matters.

Here is another list of things we are also fairly sure of. You can ignore politics for a very long time: as Adam Smith noted, it takes "a great deal of ruin" to damage the systems of a secure nation. Some valuations are actually cheaper than they were a few years back (rising profits in the US have meant falling p/e ratios). One should be careful of predicting disaster more often than absolutely necessary. Inflation doesn't necessarily bother bull markets until it hits 4%-plus. And finally, all bull markets always go on longer than anyone rational thinks they should.

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Merryn Somerset Webb
Former editor in chief, MoneyWeek