The Rational Minder Podcast - Episode 239

The time value of money is fundamental to all the finance and personal finance. Compounding increases the value of an investment at an exponential rate, but it also increases the cost of a loan over time. When you leave money under a mattress, you expect to lose purchasing power to inflation. Both compounding and discounting are fundamental and very important concepts.

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The concept of financial math is another foundational element of investing and good economic decision-making, and today we are carrying on the recent string of shows dealing with these kinds of fundamental aspects. First, we have a look at the central idea of the time value of money, and how this plays into many areas of our finances, such as retirement planning, spending, investing, and so on. From there, the conversation goes on to cover exponential functions, the tradeoffs between saving and spending, and regrets. Today's 60-second episode recap is of the great conversation we had with David Blitzer back on Episode 54, and we also do a quick book review of the potentially life-changing How to Live on 24 Hours a Day. We finish off this punchy episode with some news from the community and some thoughts on the ways in which competition and repetition can improve a skill.

Key Points From This Episode:

• Introducing the time value of money, as well as the concepts of compounding and discounting. (0:03:07)

• Applying financial math in different ways to varied questions. (0:11:34)

• Lessons from Cameron's first business selling worms. (0:18:15)

• The challenges and biases associated with exponential functions. (0:20:27)

• Spending and saving; illuminating the reality of the tradeoffs. (0:27:26)

• The biggest problems of foundational regrets. (0:35:40)

• Looking back on the episode with David Blitzer on indexing. (0:42:33)

• Reviewing the 1908 book, How to Live on 24 Hours a Day. (0:44:25)

• TV shows, podcast reviews, updates from the community and more. (0:49:05)

• Incentives and leaderboards; unpacking the impacts of practice and competition. (0:56:43)

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