Final answer:
Increased control over cash sales is achieved by having a centrally located cashier oversee transactions, often facilitated by self-scan checkout technologies allowing one cashier to manage multiple aisles.
Step-by-step explanation:
Control over cash sales is increased if a centrally located cashier participates in each transaction. This refers to the implementation of technology in modern retail, such as market's self-scan checkout aisles. The addition of automated cashiers allows for efficient oversight of multiple transactions simultaneously. It enhances control over cash sales because it minimizes the risk of human error and theft. A single cashier can now effectively monitor transactions at several self-scan aisles, which increases the effectiveness and control over the sales process. This is a significant shift from the traditional model where each checkout aisle required an individual cashier.