Contrast in Bank Reserves: Grain in the Marco-Julia Model vs. Central Bank Reserves in Reality

The Complication of Interbank Payments in Modern Economies

When a customer pays for groceries by tapping their phone at the checkout counter, a series of electronic messages are exchanged. In a simplified system where both the customer and the grocery store use the same bank, what is the most accurate description of the fundamental financial event that occurs on the bank's records?

Explaining an Electronic Transaction

When a customer pays a merchant using a mobile app, and both use the same bank, the bank's primary action is to transfer a portion of the physical currency it holds for the customer directly to the merchant's account.

Imagine a simplified economy where a single bank serves all customers. Customer A has an account balance of $500, and Customer B has a balance of $200. Customer A buys a product from Customer B for $50 and pays electronically. Assuming the transaction is processed instantly, which statement best describes the immediate impact on the bank's records?

A customer buys a product for $20 from a merchant using a mobile payment app. Both the customer and the merchant have accounts at the same bank. Match each component of this transaction to the most accurate description of the change in the bank's records.

Analyzing a Payment App's Marketing

Critiquing a Common Misconception about Electronic Payments

A customer uses a mobile app to pay a merchant $50 for a service. Both the customer and the merchant have accounts at the same bank. Arrange the following events in the correct chronological order as they would be reflected in the bank's internal records.

An economics student explains a mobile payment between two customers of the same bank as follows: 'When I pay you $10 using my banking app, the bank takes $10 of my money that it's holding for me and moves it into a separate pile it's holding for you.' Which of the following statements best identifies the fundamental flaw in this explanation?

Impact of an Electronic Transaction on a Bank's Liabilities