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The textbook / Chapter 1 · The Evolution of Money

The Money Museum

People have trusted shells, stones, paper promises and code. Walk through the rooms and see what each one solved, and what it broke.

Every one of these was money once.

Read the label, check the source, then follow the money.

Tap a room. The path runs from the oldest idea to the newest.

1Room 1 · Money from the Sea

Cowrie shell

China · about 1600–1000 BC · Shell, 17 mm

Small enough to count, hard to fake, and only found far away by the sea. Cowries passed as money across Africa and Asia for centuries. In Chinese writing, the shell still sits inside the characters for money, buy and value.

Ask yourself Why would a shell from a faraway sea be worth more inland?

Source British Museum, cowrie money 1979,0228.17 (on display, Room 68: Money); MoneyMuseum Zurich, cowrie money (the characters)

Follow the moneyWhat makes something good money?Commodity moneyScarcity

2Room 2 · Money That Never Moved

Rai stone

Yap, Micronesia · quarried for centuries; the last one arrived in 1931 · Limestone from Palau, about 280 miles away

Carved on another island and carried home across open ocean. The biggest are 12 feet across and weigh 8,800 pounds, so they stayed put. When one changed hands, everyone just knew who owned it now. The island's memory was the ledger.

Ask yourself If nobody moves the stone, what actually changes hands?

Source Houston Museum of Natural Science, “Hard currency: Stone money of the Yap Islands” (May 2015)

Follow the moneyLedgerScarce, durable, not portableHow we got here: the timeline

3Room 3 · Paper Promises

Gold certificate

United States · authorized 1863, first issued Nov. 1865; recalled 1933 · Paper, a receipt for gold

A receipt: gold sat at the Treasury and the paper said so. Then on April 5, 1933, an executive order told Americans to hand in their gold coins and gold certificates for ordinary paper dollars. By January 1934, no U.S. currency could be turned in for gold.

Ask yourself What is a receipt worth when the one holding the gold changes the rules?

Source U.S. Bureau of Engraving and Printing, Gold Certificates (history); Executive Order 6102, April 5, 1933 (American Presidency Project)

Follow the moneyGold standard1971: the day the dollar changedGold clause

4Room 4 · When Paper Breaks

100 trillion dollar note

Zimbabwe · dated 2008; trillion-dollar notes announced Jan. 16, 2009 (reported) · Paper, fourteen zeros

The biggest number ever printed on a banknote. At the peak, in November 2008, prices rose an estimated 79.6 billion percent in a single month. The zeros weren't the problem. They were the receipt for it.

Ask yourself Who noticed first: the people holding the notes, or the people printing them?

Source Johns Hopkins Magazine, “What hyperinflation looks like” (Aug. 27, 2009), Steve H. Hanke's estimate; Banknote News, Zimbabwe's 10-, 20-, 50- and 100-trillion dollar notes (Jan. 2009)

Follow the moneyHyperinflationInflationWhy does everything cost more?

5Room 5 · Money as Information

Hardware wallet

Sold worldwide · first sold 2014 (maker's own history) · Plastic, a chip, a screen

It doesn't hold any bitcoin. It holds the private keys that prove the bitcoin on the network is yours, and it keeps them off your phone and laptop. Lose the device and the seed phrase, and nobody can give it back. No bank, no recall order.

Ask yourself Is money you hold yourself freer, or just more your responsibility?

Source Trezor, “A decade of pioneering” (the maker's own history: Model One launched July 29, 2014)

Follow the moneyHardware walletPrivate keySeed phraseWhat is Bitcoin?

Drawings: MWM line art, drawn for this page. Labels checked Oct. 25, 2026.