> For the complete documentation index, see [llms.txt](https://earn.blink.sv/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://earn.blink.sv/chapter-102-what-is-money/102.03-lesson-money-evolution.md). # 102.3 Lesson - moneyEvolution **Screen:** moneyEvolution **Headline:** Money has evolved, since almost the beginning of time. **Reward:** 2 **Text:** Thousands of years ago, a society in Micronesia used very large and scarce stones as a form of agreed currency. Starting in the 1500’s, rare Cowrie shells (found in the ocean) became commonly used in many nations as a form of money. And for millennia, gold has been used as a form of money for countries around the world -- including the United States (until 1971). \================================================================= ## QUIZ **Question:** What are some items that have been historically used as a unit of money? **Answer:** Stones, seashells and gold **Feedback:** Correct. Items that are rare and difficult to copy have often been used as money. **Correct:** true **Answer:** Tiny plastic Monopoly board game houses **Feedback:** Wrong. They may have value when playing a game -- but not in the real world! **Correct:** false **Answer:** Coins made of chocolate **Feedback:** Nope. They may be tasty. But they are not useful as money. **Correct:** false