Week 39: sales up 13.0%, gross profit down 1.9%
21–27 September 2026, compared with the week before
Needs review
- Gross profit isn't split by section, so the drop can't be traced to one section.
- Ad spend rose 89.5%. The data doesn't show that it drove the growth in fiction.
Sales were £18,640, 13.0% more than last week, and every section grew, fiction most of all. Gross profit was £6,150, 1.9% lower: sales rose by £2,140 while gross profit fell by £120, so this week's books earned less on each sale. Gross profit by section is needed to find out why.
Sales
£18,640
+13.0%
Transactions
1,139
+9.0%
Gross profit
£6,150
−1.9%
Ad spend
£720
+89.5%
Sales: fiction grew the most
Fiction sold £1,740 more than last week (+21.4%) and made up more than half of the week's sales. History & Biography grew 3.6% and Children's 6.6%.
Transactions: 27 fewer in Children's
Children's sales rose 6.6%, but its transactions fell from 268 to 241 (−10.1%), so each customer bought more. Fiction transactions grew 22.9%.
Gross profit and ad spend
Ad spend went from £380 to £720, and gross profit from £6,270 to £6,150. Neither is split by section, so the data can't show how the two are related.
For next week
- 1.Split gross profit by section to see where the drop came from.
- 2.Look at what each Children's transaction included, and whether school reading lists explain it.
- 3.Check where the extra £340 of ad spend went.
Every number here is read from your data; the model never types one.

