The Flaw in 'Can I Afford It?'
For generations, the primary question before a major expense—be it a new car, a high-end smartphone, or a lavish vacation—has been about affordability. We check our bank balance, review our credit card limit, and maybe calculate monthly EMIs. If the numbers
work, we often proceed. But this approach is deeply flawed. It only tells you if you can mechanically complete the transaction, not whether you *should*. It ignores the most crucial factor: the actual value the purchase will bring to your life. Answering 'yes' to affordability can still lead to buyer's remorse, where an expensive item ends up gathering dust, its initial thrill long gone.
The New Rule: Cost Per Use
Instead of asking if you can afford it, ask yourself this: What is the 'cost per use' or 'cost per hour of joy'? This simple calculation reframes the entire decision. It's not about the initial financial hit, but about the long-term value you extract from your purchase. To calculate it, you simply divide the total cost of the item by the number of times you realistically expect to use it over its lifetime. For experiences like a holiday, you can divide the cost by the hours of enjoyment. This mental model forces you to move beyond the sticker price and confront how an item will actually integrate into your daily existence.
Putting the Rule into Practice
Let’s take a few examples. Consider a premium coffee machine that costs ₹25,000. If you use it every single day for three years, that’s roughly 1,100 uses. The cost per cup? About ₹23. This is far cheaper than a daily coffee from a cafe, making it a fantastic investment in your daily happiness. Now, think about a designer outfit costing ₹40,000 that you might only wear to two weddings. The cost per use is a staggering ₹20,000. Suddenly, it doesn't seem so glamorous. What about a ₹1,50,000 home theatre system? If your family uses it for movie nights twice a week (104 times a year) for five years, the cost per viewing is about ₹288. Is two hours of family entertainment worth that? This framework doesn't give you a 'right' answer, but it provides powerful clarity.
Why This Works Psychologically
This rule is a powerful tool against impulsive, emotion-driven spending. The thrill of a new purchase releases dopamine, a brain chemical associated with pleasure and reward. Marketers are experts at triggering this. The 'cost per use' rule acts as a circuit breaker. It forces a moment of logical reflection, shifting your mindset from the immediate gratification of acquiring something new to the practical reality of owning and using it. By visualising its role in your future, you’re more likely to align your spending with your actual values and lifestyle, not a fleeting desire. It helps differentiate between things you want to *have* and things you want to *use*.
Know Its Limitations
Of course, this rule isn’t a perfect fit for everything. It’s designed for discretionary spending—the wants, not the needs. You don’t need to calculate the cost per use of your monthly rent or groceries. It’s also less applicable to purchases that are pure investments, like stocks or education, where the return isn't measured in 'uses' but in financial growth or career opportunities. The 'cost per use' framework is a mental model, not an inflexible law. Its primary purpose is to bring intention and mindfulness to the big, optional expenses that have the potential to either significantly enhance your life or become expensive regrets.
