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Buying over time and rebalancing

Lesson 4 of 5
By the end of this lesson you’ll be able to work through a schedule of regular purchases and a rebalance with your own numbers, and say what each method can and can’t protect you from.
A collage of a huge topiary swan on pale gravel. Its head and breast still fit a thin blue wire frame, but its back has grown far past the wire, and a gardener on a tall ladder is clipping the overgrowth with long shears.

Buying a fixed sum on a schedule

The first method takes one decision away from you: when to buy. You pick a sum and a date, say $100 on the first of every month, and buy whatever that sum gets you at that day’s price.

When the price is low the $100 buys more coins. When it’s high it buys fewer.

Take a made-up coin over five months.

Month 1, at $502.0 coins
Month 2, at $402.5 coins
Month 3, at $254.0 coins
Month 4, at $402.5 coins
Month 5, at $502.0 coins
A made-up coin. You spend $100 each month, and each bar shows what it buys. Total: $500 for 13.0 coins.

You paid $500 for 13 coins, so each cost you $38.46 on average. The average of the five prices was $41. The same $100 bought more coins in the low-price months, which is why you paid less than the average price.

The price coming back to $50 is part of the made-up example, and a schedule promises no recovery.

The method’s real value is that you no longer have to guess when to buy. It also spreads one big nervous purchase over many small dull ones.

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