Are you prepared for liquidity risk?

Earlier this year, the Financial Times reported that the Federal Reserve was considering imposing exit fees on US-based corporate bond funds to reduce the risk of a potential run on these funds. On the face of it, this may not sound like a good idea: after all, there are few things more likely to start a panic than telling people you're going to make it harder to withdraw their money.

But misguided or not, it's a clear sign that regulators are concerned about the mismatch between how easy it is for investors to pull money out of funds and howdifficult it might be for the funds tomeet those redemptions.

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With stocks, that wouldn't usually create many difficulties, except at times of extreme market stress. But most corporate bonds are far less liquid than equities: they change hands in infrequent large block trades arranged through broker-dealers instead of continuous, transparent trading on an exchange.

If investors began pulling large amounts of money from multiple funds, the market might not be able to absorb all the resulting sales in an orderly manner. That could lead to a fire sale by funds desperate for liquidity, leading to a spiral of falling prices and panicked selling.

Meanwhile, a key liquidity buffer has shrunk. Historically, the major bond dealers the trading desks of major investment banks have acted as market makers, meaning that they've been willing to buy when other investors are selling.

But this role involves holding a large stock of bonds, and a combination of lower risk tolerance and tougher regulation in the US has made it less attractive, as their falling bond inventories show.

Factor in the impact of exchange-traded funds, whose need for reliable liquidity could add even more selling pressure in a panic, and it's easy to see how a sell-off might get out of hand. With bond valuations stretched, regulators are right to be worried. Investors should take note.

Cris Sholt Heaton is the contributing editor for MoneyWeek.

He is an investment analyst and writer who has been contributing to MoneyWeek since 2006 and was managing editor of the magazine between 2016 and 2018. He is experienced in covering international investing, believing many investors still focus too much on their home markets and that it pays to take advantage of all the opportunities the world offers.

He often writes about Asian equities, international income and global asset allocation.