Time Balance properties decide how data rolls up from Months to Quarters and Years.
1. The Definitions
* Flow (None): Adds all months together ($Jan + Feb + Mar = Q1$). Used for Revenue.
* Last: Takes the value of the last month with data. Used for Cash/Inventory.
* First: Takes the value of the first month. Used for Opening Balances.
* Average: Calculates the average across the months. Used for Headcount.
2. The Piggy Bank Example
* Flow (Salary): Getting $50 every month = $150 total for the quarter.
* Last (Balance): If you have $300 in your bank in March, your Q1 balance is $300, not the sum of every month.
3. Why it Matters
It prevents the system from "triple-counting" your assets. Without this, your Balance Sheet would show you have 3x the cash you actually own!