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There are few true “laws” in economics. Most of the so-called economic laws are highly conditional and only apply in limited circumstances and for brief periods of time.
One of the few economic theories that comes close to being an ironclad law and has stood the test of time is the “Impossible Trinity.” The key to understanding it is the word “impossible.”
Right now China is falling victim to the Impossible Trinity.
China’s inevitable failure will result in a maxi-devaluation of the Chinese yuan (CNY) in the coming months, as I explain below.
The theory of the Impossible Trinity is that an open economy (meaning one that is open to trade and capital flows) cannot pursue three specific policies simultaneously.
The three policies that cannot be pursued at the same time are: an open capital account, a fixed exchange rate and an independent monetary policy.
The first part of the Impossible Trinity is an independent monetary policy.
This simply means that your central bank can set rates where they want without regard for what other central banks are doing.
The second part of the Impossible Trinity is the open capital account.
This refers to the ability of investors to get their money in and out of a country quickly and easily.
The third part of the Impossible Trinity is a fixed exchange rate.
This simply means that the value of your currency in relation to some other currency is pegged at a fixed rate.
An economy can attempt to pursue all three policies, but it is certain to fail sooner rather than later.
The only question is the exact timing of the failure and the particular policy that must be abandoned as a result.
The reason the Impossible Trinity is impossible is because of the difference in interest rates — in this case, the difference between Chinese and foreign interest rates.
Consider the case of a country — call it Freedonia — that wants to cut its interest rate from 3% to 2% to stimulate growth. At the same time, Freedonia’s main trading partner, Sylvania, has an interest rate of 3%.
Freedonia also keeps an open capital account (to encourage direct foreign investment).
Finally, Freedonia pegs its exchange rate to Sylvania at a rate of 10-to-1. This is a “cheap” exchange rate designed to stimulate exports from Freedonia to Sylvania.
In this example, Freedonia is trying the Impossible Trinity. It wants an open capital account, a fixed exchange rate and an independent monetary policy (it has an interest rate of 2%, while Sylvania’s rate is 3%).
What happens next?
Savvy investors borrow money in Freedonia at 2% in order to invest in Sylvania at 3%. This causes the Freedonia central bank to sell its foreign exchange reserves and print local currency to meet the demand for local currency loans and outbound investment.
Printing the local currency puts downward pressure on the fixed exchange rate and causes inflation in local prices.
Eventually something breaks.
Freedonia may run out of foreign exchange, forcing it to close the capital account or …read more
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