Janine Wiedermann January 23, 2018 Category Insights, Keyword Insights, Education, How-To Bed Sheets Category - Insights from ShelfTrend's Supply Demand Report Janine Wiedermann January 23, 2018 Category Insights, Keyword Insights, Education, How-To The Supply Demand report shows the distribution of listings and average weekly sales volume by price, using top ranking listings created within the last 18 months. Filter by seller, brand, category, keywords, price range and region.