Light switch and payment card: what they have in common

1. Step 1. Light switch — uses — Electrical conduction. Contacts close the circuit.
2. Step 2. Electrical conduction — is used in — Silver. The best conductor.
3. Step 3. Silver — is material for — Coin. Silver coins.
4. Step 4. Coin — evolved into — Paper money. A replacement for metal money.
5. Step 5. Paper money — evolved into — Payment card. The next form of money.

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