Delta Dollar Decision Rule
Don't waste time thinking if delta amount is less than a certain value
Set a threshold below which one will not waste thinking time – the answer should be a Yes. For me, that threshold is $100 (Rs 7,500). This simplifies decisions like buying a book, booking a better seat on a flight, going to a better restaurant for a business meeting – the answer is always Yes. The same applies in business also – the decision threshold can be higher. Always look at the benefits and the delta, rather than the absolute.
He gives another example of this "Delta Dollar Decision"
As he says, don't spend mindlessly. Have few categories (self-improvement, education ...) where this becomes default.
every small spend adds up – but there are some categories where the delta needs to be seen on the large spend base, rather than as an integer by itself.