Trader Fred DeMarco watches a screen as he works on the floor of the New York Stock Exchange: The longer you hold equities, the greater your chances of a decent return. But how long is necessary? Photograph: Brendan McDermid/Reuters

Proinsias O’Mahony takes a look at the ups and downs of the stock market

Warren Buffett:  a born investor who accumulated a $73 billion fortune while remaining indifferent to the trappings of wealth. Photograph: Paul Morigi/Getty Images

Self-effacing and frugal, the €73 billion man isa maverick in the world of markets

The outperformance of sin stocks – tobacco, alcohol, gambling and arms – appears to be a global phenomenon

Proinsias O’Mahony takes a look at the ups and downs of the stock market

German bourse trader Matthias Praeger looks up to check his monitors as he sits in front of the German share price index DAX board at the stock exchange in Frankfurt. Photograph: Kai Pfaffenbach/Reuters

Proinsias O’Mahony assesses if European equities are really good for further gains

NYSE traders: Critics say cap-weighted indices run the risk of significant declines if a handful of constituent stocks tumble and that tracker funds will end up being too invested in overpriced stocks, and too little in underpriced stocks. Photograph: Brendan McDermid/Reuters

Hybrid approach aims to combine the best parts of active and passive investing

US stocks gained last week, but it has been an iffy 2015 for the S&P 500, which has badly underperformed other developed markets. Photograph: by Andrew Burton/Getty Images

Proinsias O’Mahony takes a look at the ups and downs of the stock market

Checking Japan’s Nikkei: buying unpopular stocks on the Japanese index between 1981 and 2010 returned 13.6 per cent annually, compared with a meagre 3.97 per cent for the overall market. Photograph: Toru Yamanaka/AFP/Getty Images

It usually pays to buy what’s unloved and steer clear of the flavour of the month

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