Google informs me that the advice to "sell in May, and go away" comes from the tradition of British merchant bankers—I presume in the 19th century—to leave London for the country side in May and come back on St Leger's Day in September. I am partial to a good anecdote, but does it work? In order to check, I ran a little study using the S&P 500 going back to 1991. The first chart below shows the returns you would have foregone by selling in May and waiting 35 weeks and 17 weeks, respectively, before buying back. I have included both mean and median returns, because the outliers can skew the former when your sample size is not large. The second chart shows the results of a strategy which shorts the S&P 500 in May, buys the first week of October, and holds until year end.
Read MoreInvestors have found it difficult to resist the temptation to become armchair generals in response to the recent flurry of geopolitical volatility. I have some sympathy for that. Political experts told us that Mr. Trump would mark the beginning of a new U.S. isolationism, and even speculated about the emergence of a new Monroe doctrine. The president's "America First" discourse, the statement that NATO is obsolete, and the rapprochement to Russia were all pivots watched ominously by other world leaders, especially in continental Europe.
This story, however, increasingly feels like ancient history.
Read MoreI have a feeling that equity markets are setting a trap for investors, but I can't quite figure out which kind it is. Will the last bull be sucked in before the disappointment sets in, or are we now on a sustainable glide path towards new highs with maximum frustration for the sceptics? We didn't get any decisive clues last week. Equity volatility rose a tad, but ranges remain incredibly tight across a number of key asset markets. False breaks are guaranteed, and vol-sellers will continue to play cat and mouse with the heroes trying to straddle the ranges, playing for a breakout.
Read MoreI am generally a tolerant guy, but when it comes to a debate on international capital flows I am a raving lunatic. I have no time for amateurs, and it is my clear impression that president Trump’s trade advisors, and those who agree with them, are just that. You need to understand where I am coming from, though. Specifically, you need to read my two essays about QE, population ageing and the global paradox of thrift. Here is a summary if you don’t want to read the whole thing; read it carefully.
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