Retirement income planning is, according to the Nobel Prize-winning economist William Sharpe, “the hardest and nastiest problem in finance”.

Sharpe is best known as the inventor of the Sharpe ratio, which is a way of measuring risk-adjusted returns, and those tasked with creating both cautious portfolios and with income portfolios have had to grapple with many challenges in recent years.

For most of the decade after the global financial crisis, the challenge came on the income side of the ledger as bonds, traditionally the source of income in such portfolios, yielded nothing, while many of the equities that went up were those that did not pay a yield.

Then came the pandemic and its aftermath. The resulting inflation caused bond prices to fall sharply, creating losses that dented the returns from defensively managed portfolios — strategies that would usually be overweight to fixed income. 

But the consequent higher bond yields also changed the picture for income investors, as income was, for the first time in more than a decade, available from a fixed income allocation, but at a price of higher volatility. 



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