The Psychology of "Spending Money"

Have you ever noticed that after receiving a bonus or a tax refund, you tend to treat yourself or use the money for fun purposes like clubbing or shopping? Or, consider that you might spend ₹10 per day on a daily tea but feel hesitant to buy a meal worth ₹200—even though over a month, the total expense on tea amounts to ₹300, which is more than the cost of that meal. The tea, however, is easier to justify as a “daily indulgence.” Similarly, if you are an investor, you might create a separate portfolio for “safe” investments—the money you intend to safeguard. Ever wondered why this happens? This behavior can be explained by a concept called Mental Accounting or Psychological Accounting, first coined by Richard Thaler, which explains how we subconsciously categorize, code, and evaluate economic outcomes while managing our money.

The notion behind this concept is that people assign different values to money based on context, leading to irrational decision-making. In simple terms, the concept suggests that people treat money differently based on subjective criteria, which can lead to irrational spending and affect their investment decisions.

For example, imagine you have decided to see a movie. Upon entering the theater, you realize you have lost the ₹100 ticket you bought. Would you buy another ticket for ₹100? In one scenario, you may decide you still want to watch the movie, so you buy another ticket. In another scenario, you may decide that spending additional money on a replacement ticket is too expensive and choose not to buy it. Theoretically, the response should be the same in both cases because the amount lost is the same—₹100. However, according to the mental

accounting model, we often divide our finances into different budgets. In the first scenario, spending the additional ₹100 can be mentally allocated to a general spending budget, so we feel less guilt. In the second scenario, spending additional money feels like an "extra" expense, and we may feel guilt over the lost ticket. This demonstrates how handling the same amount of money differently based on mental classification can lead us to make irrational financial decisions, such as overspending or poor investment choices.

How does this happen on a subconscious level? To understand, we can look at Thaler’s concept of fungibility in his critique of mental accounting theory. Fungibility is the idea that all money should be treated equally, regardless of its intended use or origin. Thaler observed, however, that people often violate this principle with windfalls like bonuses, tax refunds, lottery prizes, or birthday money. For instance, people are more likely to use "gift money" for indulgent expenses they wouldn’t justify with their regular income. Based on sound financial strategy, Thaler suggested treating all money equally, spending windfalls as carefully as regular income.

In summary, Mental Accounting shows how our automatic classification of money can influence decisions around investments, savings, and spending, often leading to irrational behavior. Richard Thaler’s theory highlights how our minds compartmentalize money according to perceived source or purpose, which frequently results in inconsistent financial behavior. When we consider windfalls or "gift money" differently, we might spend on things we wouldn’t normally buy if we thought of it as regular income. Understanding this bias can help us examine our financial habits and consider adopting a more holistic approach by valuing all income equally, regardless of its source. This shift can lead to more disciplined financial decisions, helping us better manage our finances and allocate resources more wisely.