Did November's revenue cost us the margin?
bars: revenue (left) · line: margin % (right) · illustrative
R0
R5m
R10m
10%
18%
26%
May
Jul
Sep
Nov
Dec
14% — margin floor
Record bar, lowest line: November's promo bought revenue at 14% margin, and December only recovered to 18. Both axes zero-anchored and labelled — dual axes lie easily otherwise.