Why gold is money?

28 March 2022

The economist John Maynard Keynes famously called gold a “barbarous relic”, suggesting that its usefulness as money is an artifact of the past. In an era filled with cashless transactions and hundreds of cryptocurrencies, this statement seems truer today than in Keynes’ time.

However, gold also possesses elemental properties that has made it an ideal metal for money throughout history.

The Periodic table

The periodic table organizes 118 elements in rows by increasing atomic number (periods) and columns (groups) with similar electron configurations.

Just as in today’s animation, let’s apply the process of elimination to the periodic table to see why gold is money:

  • Gases and liquids
    Noble gases (such as argon and helium), as well as elements such as hydrogen, nitrogen, oxygen, fluorine and chlorine are gaseous at room temperature and standard pressure. Meanwhile, mercury and bromine are liquids. As a form of money, these are implausible and impractical.
  • Lanthanides and actinides
    Next, lanthanides and actinides are both generally elements that can decay and become radioactive. If you were to carry these around in your pocket they could irradiate or poison you.
  • Alkali and alkaline-earth metals
    Alkali and alkaline earth metals are located on the left-hand side of the periodic table, and are highly reactive at standard pressure and room temperature. Some can even burst into flames.
  • Transition, post-transition metals, and metalloids
    There are about 30 elements that are solid, nonflammable, and nontoxic. For an element to be used as money it needs to be rare, but not too rare. Nickel and copper, for example, are found throughout the Earth’s crust in relative abundance.
  • Super rare and synthetic elements
    Osmium only exists in the Earth’s crust from meteorites. Meanwhile, synthetic elements such as rutherfordium and nihonium must be created in a laboratory.

Once the above elements are eliminated, there are only five precious metals left: platinum, palladium, rhodium, silver and gold. People have used silver as money, but it tarnishes over time. Rhodium and palladium are more recent discoveries, with limited historical uses.

Platinum and gold are the remaining elements. 

Gold as money

Gold does not dissipate into the atmosphere, it does not burst into flames, and it does not poison or irradiate the holder. It is rare enough to make it difficult to overproduce and malleable to mint into coins, bars, and bricks. Civilizations have consistently used gold as a material of value.

Perhaps modern societies would be well-served by looking at the properties of gold, to see why it has served as money for millennia, especially when someone’s wealth could disappear in a click.

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