Real Interest Rates vs Gold Prices – What Can They Tell Us About When to Buy Gold in New Zealand?

Real Interest Rates vs Gold Prices - What Can They Tell Us About When to Buy Gold in New Zealand?

Interest Rates have been falling in New Zealand in recent months, with the Reserve Bank slashing the Official Cash Rate (OCR) by 0.50% .

What will the Reserve Bank of New Zealand do in coming months? Are rates likely heading even lower? Our guess is yes they are. Maybe we’ll even see negative interest rates in New Zealand yet too? 

Obviously the interest rate has a bearing for those New Zealanders with a mortgage and businesses with loans. But rather than focussing on the central bank announcement every quarter, we think there is a much more important interest rate to keep an eye on.

That is, what is the current “Real Interest Rate” in New Zealand?

How Do Real Interest Rates Differ From the Overnight Cash Rate (OCR) that the Reserve Bank Fiddles With?

What are real interest rates?

The nominal interest rates simply refer to the quoted interest rate on the likes of a government bond or central bank set interest rate. Whereas, the real interest rate is the interest rate, less the current rate of inflation.

Why is this so important?

Because it shows you what return you are getting on your money after inflation. When this number gets below 2% and in particular below zero (also known then as a Negative Real Interest Rate) this is when it is an especially good time to hold gold.

Why is that?

Because when interest rates are very low, there is then no “opportunity cost” in holding gold. You are not missing out on interest returns elsewhere.

As the gold haters like to remind you, gold pays you no interest. But when the bank pays you no interest (or next to none) it makes sense to swap your cash for gold instead. As in this kind of environment, you stand a much better chance of maintaining your wealth and your purchasing power with gold.

The chart below shows this relationship between US interest rates and the gold price in US Dollars..

Gold and Real Interest Rates in USA

Source: gold.org

So What is the Real Interest Rate in New Zealand Currently?

Previously we’ve been able to simply refer to the excellent charts available on Greshams-law.com. These had the benefit of plotting real interest rates in various countries including New Zealand. Unfortunately that site no longer seems to be running. So the most up to date chart we have from them only runs until 2012:

Chart of New Zealand Real Interest Rates a.k.a. interest rates after inflation

Source

How do you Calculate the Real Interest Rate?

The definition from Greshams-Law.com for ‘real’ interest rates, was the short-term inter-bank rate minus the year-on-year growth in the consumer price index. The CPI rate comes from the OECD statistics. Therefore this data is only as good as each government CPI measure, which likely means inflation is actually higher than this! 

For more on this see: Comparing NZ Money Supply, Government Inflation Statistics, Property Prices, and Gold Prices for the Last 19 Years

Sometimes we see other measures such as a 3 month bond or even a longer dated bond used. These will of course usually give a slightly higher interest rate than the interbank lending rates which are an overnight rate.

However the difference is not very much. Right now it is about 0.15% between the interbank lending rate and the 90 day Bank Bill Rate  in New Zealand. The important thing we are looking for in analysing real interest rates is the direction they are heading – the trend.

So we’ll stick with the interbank rate. It also has the advantage of going a long way back compared to some New Zealand government bond data.

The below chart shows real interest rates along with the local NZ Dollar gold price. A reminder, real interest rates are the interbank lending rate, less the change in the Consumer Price Index (CPI) from a year prior. Our chart only goes back to 1985. As that is as far as the RBNZ monthly data on wholesale interest rates goes.

Source: RBNZ, Stats NZ, World Gold Council

The Relationship Between Gold and Real Interest Rates

To our eye there appears to be a pretty solid inverse relationship between real interest rates and the gold price in New Zealand dollars. 

Throughout the 1980’s and 90’s the gold price was fairly flat or down, as real interest rates remained high. Averaging perhaps around 5%.

In the early 2000’s gold started to rise as real interest rates moved down towards 2.5%. Then they fell sharply, first down to zero and then even lower to -2.50%. This was when the NZD gold price really moved higher. Going from under $1000 to peak at over $2100 in 2011.

But then the “after inflation interest rate” started to head higher. During this time gold was correcting lower. In 2015 the real interest got back briefly above 3% before turning lower. This is also about the time when the NZD gold price also started to resumed its upwards trend.

Since then the inverse relationship has continued. 

You can see that over the past few years, the NZ dollar gold price has been trending up, while real interest rates have been trending down. This is the very relationship we discussed earlier. That is, when real interest rates are negative – or close to it – gold generally performs well as there is no opportunity cost in holding gold.

At the moment, real interest rates have once again dipped into negative territory. Meanwhile gold in NZ Dollars has hit a new record high.

Are you already worrying about low returns in the bank? These number show they are probably pretty close to zero already once withholding tax is taken into account.

But What if We Get Higher Inflation and So Interest Rates Start to Rise?

This is what happened in the 1970’s – interest rates were very high, in the teens in fact. But inflation was even higher and so gold was rising while nominal interest rates were rising. But in fact real interest rates remained negative.

So ignore any comment about how rising interest rates are bad for gold as it is the Real Interest Rate that matters.

Where to Next for Real Interest Rates in New Zealand?

Our guess? They’ll continue to head even more negative. It seems likely that the OCR will be cut lower. The bank economists are mostly saying another 2 cuts for a low of 0.5%.

We think the odds are it will go even lower. The RBNZ will follow every other central bank in a race to the bottom. Negative nominal interest rates are a distinct possibility.

So if inflation simply stays around current lowish levels, then the real interest rate will head even more negative.

We’d say it makes sense to keep an eye on this chart.

As if the government cranks up spending, maybe we’ll finally get some higher inflation too? That would produce even lower real interest rates. Much like in the 1970’s (see the US chart from earlier, where real rates got as low as -6%).

So it’s likely that gold in NZD will remain the place to be while this is going on. We think there will be much higher gold prices in New Zealand dollars to come yet. Have you bought gold yet? Check the range of gold and silver to buy here.

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Editors Note: This article was first published 8 May 2012. Updated 18 October 2019 to include all new charts with latest New Zealand data. Plus new commentary.

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