What monetary policy means for you

Monetary policy makes a difference to your investing. But what is it, and how does it affect the various things in your portfolio? Merryn Somerset Webb explains.

If you have been paying any attention to investing at all over the last decade, you will know that monetary policy makes a difference. But what is monetary policy and how does it affect the various things in your portfolio?

The answer to the first question is relatively simple. There are two parts to public economic policy: fiscal policy and monetary policy. Fiscal policy is conducted by the government, and involves the raising and spending of money through tax. The second involves managing the amount of money in an economy, and is conducted by a country's central bank.

How it works

Monetary policy sounds complicated, but all you really need to know is if it is tight or loose, and if it's likely to be tightened or loosened from here. Policy is being tightened (made more "restrictive") if a central bank is trying to stop inflation getting out of hand. (Most central banks are only formally charged with keeping inflation in check, although some such as the US Federal Reserve are also required to consider other issues, such as ensuring that employment stays strong.)

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Policy is tightened by raising interest rates or selling financial instruments usually bonds into the market (by selling things they effectively take the money used to pay for them out of circulation). It is being loosened (made more "accommodative") if the bank is trying to boost inflation (or avoid deflation). This is done by cutting rates or buying financial instruments in the market (buying financial instruments injects cash back into the economy).

This is usually done with cash the bank already holds. But since the financial crisis, the banks have been creating money so that they can buy many more bonds than they would have otherwise been able to. This is known as quantitative easing (QE) and central banks like to call it "unconventional monetary policy". We like to call it extreme monetary policy.

How it affects your investments

Generally speaking, markets rise when rates are falling and fall when they are rising. That's because lower interest rates make borrowing cheaper that's good for companies that want to borrow (for real investment, or to buy back their own shares). And it's good for anyone who wants to borrow money to consume (good for corporate profits), or to buy shares on margin (good for share prices). Higher rates do the opposite.

So if you buy when monetary policy is accommodative or when you expect it to get more accommodative, you should do well. Look to the post-crisis period in America: there were major rallies in the US market after each QE announcement between 2008 and 2012. Bonds do well when policy is loose too. Bond prices have an inverse relationship with interest rates so as rates fall and are expected to keep falling, bond prices rise. The minute that expectations change, however and the market thinks rates might rise bond prices will change direction.

Property should also do well when rates are low or falling: the cheaper it is to borrow, the more people are likely to borrow to buy. You could even, should you want to, make a good case that the rise in UK house prices over the last 30-odd years has been less about planning and population, than about the constant drift downwards in interest rates.

The direction of monetary policy will also have an effect on currencies if rates are rising, all other things being equal, the currency should strengthen. Why? Because if you can get a higher rate of interest on a dollar deposit than a sterling one, you might be more minded to buy dollars than pounds.

Watching the central banks

None of these relationships are set in stone: negative interest rates haven't done much for Japanese equities, for example. However, they are important, so all investors should keep an eye on them.

Most of us will just need a sense of the trend of monetary policy. But those who want to take this very seriously can watch announcements and the release of minutes from all the big central banks in particular, the Federal Reserve, the European Central Bank, the Bank of Japan and the Bank of England. They will also watch the same leading indicators the banks watch when deciding on their next move. These include changes in consumer price inflation, but also factors that might drive inflation or deflation in the future, such as wage growth, commodity price shifts and employment.

Merryn Somerset Webb

Merryn Somerset Webb started her career in Tokyo at public broadcaster NHK before becoming a Japanese equity broker at what was then Warburgs. She went on to work at SBC and UBS without moving from her desk in Kamiyacho (it was the age of mergers).

After five years in Japan she returned to work in the UK at Paribas. This soon became BNP Paribas. Again, no desk move was required. On leaving the City, Merryn helped The Week magazine with its City pages before becoming the launch editor of MoneyWeek in 2000 and taking on columns first in the Sunday Times and then in 2009 in the Financial Times

Twenty years on, MoneyWeek is the best-selling financial magazine in the UK. Merryn was its Editor in Chief until 2022. She is now a senior columnist at Bloomberg and host of the Merryn Talks Money podcast -  but still writes for Moneyweek monthly. 

Merryn is also is a non executive director of two investment trusts – BlackRock Throgmorton, and the Murray Income Investment Trust.