Kmart was once a big retailer but since the waves of closings, it's gone downhill fast.
Kmart's subsidiary, Sears went defunct as a brick and mortar store but their catalogue experience made them the number one online retailer, surpassing even amazon.com
Kmart, however, kept closing stores. By 2020 the stores were in undesirable neighborhoods with poor economies. They, however, still brought in decent revenue since they were basically the dollar store alternative with a wider range of products.