Suppose a grocery bill is usually $100 a week, and (for simplicity's sake) let's say it buys 30 food items. In the example I'm referring to, $100 would still be

Suppose a grocery bill is usually $100 a week, and (for simplicity's sake) let's say it buys 30 food items. In the example I'm referring to, $100 would still be spent, but 35 food items purchased. This could only be considered "saving money" if the extra food allowed you to spend less than $100 on next week's groceries. Anyhow, sorry for being confusing. It's possible this example isn't all that common in general. I just bump into it all the time.