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(Image: AAP/Private Media)

In a crisis, never underestimate the popularity of cash. The Reserve Bank’s (RBA) regular data series on banknotes shows Aussies seeking refuge in the sort of money that can’t be brought asunder by a blackout or a Chinese cyber attack. And when we turn to cash, we favour 50s. The $50 bill, known colloquially as the pineapple for its bright yellow colour, has been in hot demand this year, and the RBA’s note printing arm has churned out an additional $7.5 billion of them since the end of January.