The $6 coffee is the most talked-about example of small spending, and by this point most people are tired of hearing about it. But the underlying point still holds: purchases that feel trivial in the moment add up in ways that are genuinely surprising when you look at a full month of bank statements.
The math most people never actually do
Take a few common small purchases and run them out to a month. A $6 coffee five days a week is $120. A $12 lunch twice a week is $96. A $4 afternoon snack three days a week is $48. Two $15 impulse purchases on Amazon is $30. A $10 app or subscription you barely use is $10. That is $304 a month from purchases that none of them felt significant. For a lot of households, that is more than they spend on utilities.
Why your brain underestimates this
Psychologists call it "the pennies a day effect." When something is framed as a small daily cost, the brain treats it as negligible rather than multiplying it out over time. Subscription services use this deliberately. A $12.99 per month service is presented as $12.99, not as $155.88 per year or $779.40 over five years. Neither number is deceptive, but one is more likely to get a yes.
The problem is not any individual purchase
The coffee is not the issue. Getting lunch out is not the issue. The issue is when you have not made a deliberate choice about how much of your income goes toward this category. People who feel fine about spending $120 a month on coffee because they decided to are in a different position from people who spend $120 a month on coffee and are surprised to discover it when they check their statement.
A practical way to get a grip on this
Look at your bank and card statements for the last 30 days and add up everything under $20. Do not judge the individual purchases. Just get the total. Most people find it is meaningfully higher than they expected. From there, you can decide which of those purchases you genuinely value and which ones were just habit or convenience. The ones you value, keep. The others are where you actually have room to move.
One change that makes a real difference
Set a weekly cash budget for discretionary small spending. Once it is gone, it is gone for that week. This is not deprivation. It is just replacing vague discomfort about spending with a clear boundary. Most people find that having the limit makes them more deliberate without actually reducing their enjoyment of the things they choose.