e-coupons - % Off or £ Off?

An eretailer did a simple A/B split test using different ecoupon offers and found:

• $50-Off Coupon generated 170% more revenue than the 15%-Off Coupon.
• $50-Off Coupon had 72% higher conversion rate.
• The 15%-Off Coupon did generate an average order size that was 44% higher.

See the full Marketing Sherpa case study here: Dollars-Off Coupon Gets 170% More Revenue: 2 Simple A/B Test Steps