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

steady tap. “It is called shrinkage, Mom. It is a standard retail metric. Most of the time it is internal theft, or cashiers keying in the wrong barcode numbers at the register.”

“But could the database itself be wrong?” I asked, thinking of the duplicate egg charges. “What if the software is making mistakes and charging people for things they never continue reading …