Why Martha Saved Five Hundred Paper Receipts From Her Weekly Grocery Trips

” I asked.

Gerald pulled a yellow highlighter from his pocket and began marking lines on the third page.

“These overrides are grouped in blocks of four or five, always within a twenty-minute window.”

He capped the marker with a sharp click.

“And they always happen during the late afternoon shift changes.”

“Is that when the store is busiest?continue reading …