Stockpiling is the activity of acquiring and storing a large quantity of something. 
Consumer stockpiling refers to behavior by consumers acquiring a large quantity of a product (which may affect future consumer demand). 
An example of consumer stockpiling is the excessive acquisition and storing of bathroom tissue that occurred during the 2020 Covid-19 pandemic.
- Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers
- Common Language in Marketing Project, 2020