Findings Concerning Small Purchase Rounding
The arithmetic always works out. This is because the person doing the arithmetic controls the rounding.
FORENSIC ANALYSIS Subject: Small Purchase Rounding Evidence Type: Internal Arithmetic
Evidence, Item 1: The Coffee
Price paid: Rs. 120.
Mental representation of price paid: "essentially a hundred."
Savings goal contribution for the day: positive, because the coffee was not lunch.
Evidence, Item 2: The Lunch
Price paid: Rs. 320.
Mental representation: "about three hundred."
This is Rs. 20 less than Rs. 320 and Rs. 20 more than Rs. 300. The representation selected is Rs. 300. The selection was made instantaneously and without awareness that a selection was occurring.
Evidence, Item 3: The Transfer
Monthly savings target: Rs. 8,000. Amount transferred this month: Rs. 7,400.
Mental representation of shortfall: "pretty close."
"Pretty close" was accepted as satisfactory. Accounting closed for the month.
The Governing Rule
Tiny purchases are mentally rounded down while savings goals are mentally rounded up. The person whose spending arithmetic always negotiates in their favor does not experience the arithmetic as negotiation. They experience it as estimation.
This is accurate. It is also convenient.
Pattern of Evidence
Small Purchase Rounding produces a momentary sense of control. That control is preserved through another comparison, check, or transfer. The check confirms the estimate. The estimate was shaped by the outcome being sought.
The balance sheet does not negotiate. The balance sheet presents the full Rs. 120, the full Rs. 320, and the full Rs. 7,400. The balance sheet's version of events is correct.
That control is preserved through another comparison, check, or transfer. The bank app is opened. The expenses are reviewed. The total is rounded to the nearest figure that permits a favorable interpretation.
Finding
Eventually the ritual becomes proof of discipline even when the balance sheet disagrees. The person reviews their spending and concludes they are, broadly speaking, on track.
The balance sheet is not consulted for this conclusion. The balance sheet would complicate it.
Status
The rounding continues. Arithmetic is consistent. Month-end assessment: broadly positive.