3 dollars a day is $1,000 per year.
Actually, it's a little more than that.
$2.74 is $1,000 per year.
But call it $3, since it's easy to remember.
This is where small numbers add up.
If you buy $4 of bottled water a day, that's over a grand per year.
If you start cooking one meal, saving yourself $10 per day - that's around $3,000 per year.
$5 of coffee per day? Yeah, it adds up.
It's a good quick heuristic to put small expenses in perspective. Irregular medium/small expenses don't break your bank. The bank breakers are the big expenses and the regular expenses. Get those two better and your cash position improves quickly.