You will be able to design your money environment so it supports your rules.
Hui Min's colleague Sandra keeps a bowl of sweets on her desk at work. Hui Min doesn't, and on most afternoons she eats none. On the days she sits next to Sandra, she eats several without noticing. Hui Min's willpower is the same on both days. What changes is the distance between her hand and the sweets. Money works much the same way, and you can rearrange the desk.
If-then rules from lesson 8.1 handle the moments you can predict. Your environment handles everything else: the apps on your phone, the cards saved in them, which account your salary lands in, what you see when you open your banking app. Each of these makes some choices easy and others harder, and most of them were set up by someone with an interest in what you do.
Lesson 5.2 showed how strongly people stick with defaults. The same principle runs through all of this. Small amounts of effort, a few taps or a minute of typing, change behaviour far more than their size suggests. You can use that in two directions. Make the choices you want happen with no effort at all, and make the choices you want to avoid take a little more.
Automation is the strongest tool you have for good choices, because it takes you out of the decision entirely. Your payday transfer from lesson 5.4 is one example. Others include a regular savings plan into your investments, a GIRO arrangement that pays your card bill in full each month, insurance premiums paid automatically so a policy never lapses because you forgot, and a fixed sum moved to each sinking fund on payday.
Each one is a decision made once, on a calm day, that then repeats without asking you again. The fewer good choices that depend on you remembering, the fewer chances present bias gets to postpone them.
Friction means adding steps between you and a choice you'd rather not make often. It doesn't have to stop the choice, only slow it enough for the deliberate part of your mind to catch up.
For spending, Money Foundations, lesson 4.3, Small habits that slow impulse spending, covers the core frictions: waiting rules, removing saved cards from shopping apps, and turning off sale notifications. Aim them at the triggers you found in your diary in lesson 4.4. If late-night scrolling is your trigger, the friction belongs on your phone at night. If group orders are, it belongs in how you handle lunch.
For investing, the equivalent is distance from the trading app. Lesson 6.4 suggested moving the app off your home screen. You can go further and delete it from your phone, keeping access only through a laptop. Regular investing still happens automatically, but trading on impulse now requires you to sit down, open a computer and log in, which is often enough time to remember your rules.
For savings, some frictions are built into the banking system. Scam-proof your money, lesson 7.2, Money Lock: savings that cannot be moved online, explains how locking part of your savings so it can't be transferred digitally protects against scams. It also works as a friction against your own impulses, though you should keep your buffer somewhere you can reach quickly in a real emergency.
Separate accounts are mental accounting from module 3, used on purpose. Money for a goal, kept in its own account at a different bank from your spending account, doesn't show up when you check what you can afford this weekend. You can still reach it. You just don't see it every day, so it doesn't tempt you.
A few details make this work better. Name each account after its goal, so withdrawing feels like taking from the wedding or the flat rather than from "savings". Don't attach a debit card to goal accounts. And keep the number of accounts manageable, perhaps one per major goal plus the buffer, because a tangle of small accounts becomes its own source of confusion.
The appeal of environment design is that you do the work once. Removing a saved card takes two minutes and then helps you every night for years. Resisting the urge to tap "buy" takes effort every single time, on the evenings when you have least to spare.
Darren spent one Sunday evening on his. He removed his card from four shopping and delivery apps, set his phone to switch to greyscale at 10pm, and checked that the GIRO payment from lesson 3.3 was still clearing his card in full. He renamed his untouchable account "Buffer" and moved his holiday money into its own account named "Japan".
Choose two frictions and two defaults that target your own triggers, and plan to set them up this week.
List two frictions and two defaults you will set up this week.
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