Hair salon
"Half my chairs are empty between 11am and 3pm."
The voucher
25% off any cut or color, redeemable Tuesday to Thursday between 11:00 and 15:00. Valid 30 days. One per customer.
Why it works
A stylist's hourly cost is fixed. Filling an empty chair at 11:30 on a Tuesday is pure margin. The voucher never reaches Saturday.