behaviour
Automate the plan as behaviour defence
The rule
How you behave matters as much as the maths. Set up an auto-payment so fear, greed, or a busy day cannot spoil it. Like a standing order for your future.
Where it flips
But auto-payment guards your behaviour; it cannot fix a wrong plan. A SIP into an unsuitable fund, at high cost, or for a goal that is too soon, just runs a wrong choice on its own. It protects a good plan; it cannot rescue a bad one.
Housel's point is that doing well with money is less about what you know and more about how you act. And acting well is hard when feelings run high. A SIP helps mainly because you decide once, as a fixed rule, instead of choosing afresh every month when fear or greed can push you around. The way it averages your buying prices is a small side benefit. The real gift is that the plan keeps running through the weak times, exactly when a manual investor would pause or stop. Setting up the monthly payment turns good intentions into a default that feelings cannot easily beat. A plan you can stick to beats a cleverer plan you drop at the worst moment.
A worked example
One investor auto-invests ₹15,000 a month into a broad index fund and keeps buying through a weak year. Another waits each month for a better price and, when markets fall, stops. The auto rule collected the cheap units the worried one skipped. [illustrative]
How to spot it
- ·the payment is set once as a fixed rule
- ·the SIP keeps running through weak markets, not paused
- ·the monthly feelings-based choice is designed out of the way
Morgan Housel · The Psychology of Money