A startup I used to know for had ‘doubling parties’. Every time the business doubled in size, there was a party. For the first party they had a glass of prosecco per person… by the 7th or 8th party, the bash was a pretty major affair.
The big picture I cling on to on my investing journey is Doubling. I want my portfolio to double as fast, and as many times, as possible.
Closely connected to Doubling is the Rule of 70 (strictly, 72). The Rule of 70 is mental shorthand for doubling: it says that if you compound growth of X% per period, you will double in 70/X periods. I.e. if you grow at 7% per year, you will double in 10 years. More to the point, if you grow at 10% per year, you will double in 7 years.

I started my rigorous portfolio tracking at the beginning of 2013. I unitise my portfolio, so I am tracking ‘underlying’ growth, stripping out deposits and withdrawals. One question I’ve been keen to answer is: how long will it take me to achieve my first Double?
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