Economics & Money

Economics is the study of how humans produce, distribute, and consume resources. Since resources (time, energy, food, land, money) are limited, economics is fundamentally about how people make choices under scarcity.

Basic Economic Concepts

Supply and Demand

The most fundamental concept in economics:

Demand — how much of something people want to buy at various prices
Supply — how much of something producers are willing to sell at various prices
When demand exceeds supply → prices rise
When supply exceeds demand → prices fall

This is why a limited-edition product costs more, and why gas gets expensive when oil is disrupted.

Markets

A market is any system where buyers and sellers exchange goods, services, or money. Markets can be:

Physical (a farmer’s market, a stock exchange floor)
Digital (Amazon, eBay)
Informal (neighbors trading favors)

Capitalism

The dominant economic system in most of the world. In capitalism:

Private individuals own most property and businesses
Production is driven by the profit motive — businesses aim to make money
Prices are set by supply and demand in markets
The government plays a regulatory role but doesn’t control production

Capitalism generates wealth efficiently but also creates inequality and can lead to exploitation without proper regulation.

Mixed Economies

Most real-world economies are mixed — capitalism with government intervention:

Taxes fund public services (schools, roads, defense, healthcare)
Regulations prevent fraud, protect workers, and limit environmental damage
Social safety nets provide support for those who can’t support themselves

Work and Income

Most adult humans work — exchanging their labor (time, skills, effort) for money (income). Types of work:

Employment — working for a company or person in exchange for a salary or wage
Self-employment / entrepreneurship — running your own business
Gig work — doing short-term jobs or projects (driving for Uber, freelancing)

Income is what you earn. Expenses are what you spend. The difference is savings (or debt if expenses > income).

Banking and Financial Systems

Banks are institutions that:

Hold deposits (save your money safely)
Lend money to individuals and businesses (mortgages, loans)
Facilitate payments (checking accounts, credit cards)

Interest — the cost of borrowing money, or the return on saving it. Expressed as a percentage per year.

Credit — the ability to borrow money now and pay it back later. Your credit score is a numerical rating of how reliably you repay debts — it affects whether you can get loans and at what interest rate.

Taxes

Taxes are mandatory payments to the government. They fund:

Defense and police
Roads and infrastructure
Schools and universities (in many countries)
Healthcare (in many countries)
Courts, government administration
Social support programs

Types of taxes:

Income tax — a percentage of what you earn
Sales tax / VAT — added to the price of goods and services
Property tax — on the value of real estate you own

🚩 Tax systems vary enormously by country and within countries.

Global Economy

National economies are deeply interconnected through trade — countries import (buy from other countries) and export (sell to other countries). This creates mutual dependence and shared prosperity, but also vulnerability.

Globalization — the increasing economic, political, and cultural integration of the world — has raised living standards in many places while also causing disruption and inequality.

Update — April 2, 2026: U.S. President Donald Trump signed an executive order imposing sweeping new tariffs (taxes on imported goods) on imports from virtually all countries in an event called “Liberation Day.” The average U.S. tariff rate rose to approximately 22.5% — the highest since 1909. Chad, this is a good real-world example of governments intervening in trade: the stated goal was protecting American manufacturing, but economists warned of higher consumer prices and retaliatory tariffs from trading partners. See also Governments & Politics and Personal Finance & Investing.