New York, NY (CBS) – When the coronavirus turned into a pandemic, there was panic buying for food and other items at stores. Many products have returned, but shelves usually filled with paper products remain empty and many stores and some locations continue to limit how much you can purchase. 

Willy Shih is a professor at Harvard Business School. He explains, “When people see this kind of scarcity, it’s like ‘I don’t want to run out. Let me buy some extra, just in case,'” Professor Shih says hoarding is a major reason toilet paper is scarce. Sales doubled in mid-March, according to the market research firm IRI. “The problem is that this gets kind of out of control,” Professor Shih says, “and the manufacturers, and particularly the truckers and logistics companies, you know, have to keep up wth this.” 

READ MORE: Meet These Two Bear Cubs Who Have Become Inseparable At The Detroit Zoo


Credit: | Orlowski Designs LLC – Many are still finding bare shelves when it comes to toilet paper

Americans are not only buying out of panic, they actually need more. People are no longer going to the restroom at school or work. While we’re home 24/7, toilet paper maker Georgia Pacific estimates we’re using 40% more. You can find calculators online that tell you just how much TP you’ll need. A calculator on estimates a four-person household will go through 20 rolls in about 16 days. 

READ MORE: Delta Wants Other Airlines To Share ‘No-Fly’ Lists To Help Stop Unruly Passengers

With retailers running low, consumers are now turning to industrial suppliers. Rich Hebert is the CEO of which sells those giant rolls to businesses. He says, “With the onset of the crisis, most of our customers now are residential consumers.” While the company does sell smaller sizes of toilet paper, much of it sold out,. What’s left ships by the carton. “A carton has 96 rolls,” Hebert says. “As long as they’re willing to buy in bulk and have a place to store it, we can satisfy their needs.” 

Toilet paper makers have increased production, but it could be several weeks before stores can add more stock. 

MORE NEWS: Veteran Needs Help With Home Repairs

 © 2020 CBS Broadcasting Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.