Welcome to August crew!
Grab yourself anything else you weren’t allowed in class, because this month is back to school.
I was wandering through a bookstore here in Valencia and asked the sales assistant if they had any books in English. He said, “Yes, we have exactly one left,” and walked me straight over to this month’s book review, The Penguin Dictionary of Economics by Graham Bannock & R. E. Baxter. I was stoked, I’ve got a few finance and economics papers coming up during summer school (November–February) for uni, and I figured this was the universe giving me a sign.
Then, as I flicked through it, I saw a bunch of terms, around 40 odd, that I thought all FI hopefuls should know. So here we are. Yes, this month’s review is a little different, and no, I don’t think any of you are about to rush out the door and buy a book of economic terms. But there’s real value in knowing some of these key terms, theories, and ratios, they could genuinely help you hit FI faster. So let’s get into it.
The Penguin Dictionary of Economics is exactly what the cover promises: an essential guide for understanding economic terms, running from “average cost” to “yield gap.” I went through it with a highlighter looking specifically for entries useful to an investor working toward financial independence, and the book earns its keep. The definitions are short, precise, and mostly free of jargon-on-jargon, a rarity for a reference text this dense. It’s not a book you read cover to cover, but one you keep on the shelf and dip into whenever a term in a prospectus, an earnings call, or a financial news article stops you short.
Right let’s get stuck in!
7 Definitions Worth Underlining for Anyone Chasing Financial Independence
Savings Ratio
What it means: the share of your income you save rather than spend. Example: Trim spending from $4,000 to $3,000 a month and your savings ratio jumps from 33% to 50%, roughly cutting your years-to-FI in half. Mr Money Moustache made the savings ratio a big deal, and really, it’s considered one of the OG FIRE ratios to know.
Compound Interest
What it means: interest earned on both your original money and the interest it’s already built up. Example: Invest $10,000 at 30 instead of 40, and those extra 10 years of growth alone nearly double what it’s worth by retirement. This is what’s really doing the heavy lifting in FI, if you give it enough time to do its work. Here’s a great little calculator for showing you the power of compound interest.
Opportunity Cost
What it means: the value of the next-best option you give up when you choose something else. Example: Buy the $20,000 car instead of the $40,000 one, invest the difference, and that $20,000 could grow into roughly $77,000 over 20 years. This simple comparison of an action and its effects is awesome for helping investors make better decisions. For example, spend $50k on a wedding and have a great day, or spend $15k on the wedding, take the remaining $35k and invest it in options at 2% a month, and that’s $700 a month you could spend on activities, weekends away, dates, or just reinvest forever to speed up your FI. I previously broke this down more comprehensively here.
Price-Earnings Ratio (P/E Ratio)
What it means: a stock’s price divided by its earnings per share, how many years of earnings you’re paying for. Example: A stock priced at 25x earnings needs far stronger growth to justify its price than one at 10x, check the P/E before you buy. This is really important at the moment when the stock market is objectively very expensive.
Capital Gains
What it means: simply the difference between what you paid for an asset and what it’s worth now. Example: Buy a stock for $5,000, sell it for $8,000, and that $3,000 difference is your capital gain. Capital gains have been in the news a lot lately, with the Australian government bringing in some fairly unfriendly rules targeting investors on this front, worth keeping an eye on if it affects you.
Monte Carlo Method
What it means: running an outcome through thousands of randomized scenarios to see how often it succeeds. Example: Ask an AI tool like Claude or ChatGPT to run a Monte Carlo analysis on your retirement number, give it your portfolio value, expected spending, and time horizon, and it’ll test thousands of market scenarios and tell you, in plain English, whether your savings would survive 30+ years and what the odds actually are.
Yield
What it means: the income something pays you, shown as a percentage of what it’s worth. Rental property, commercial property, dividend stocks, they all have a yield. Example: A stock yielding 4% vs. a fixed term cash deposit yielding 5%, compare yields side by side to decide where your income-producing money goes.
Bottom line: this book isn’t a page-turner, unless you’re a nerd or a student like me, but some of the key terms in this book are critical for serious investors. If you only remember one thing from it, make it the savings ratio entry, everything else in the FI playbook builds on that number.
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Cheers,
Andy
Valencia