Probably "by" 59%. It is true that when there are more choices there is less of a conversion rate in sales. Studies have shown that when there is 3 types of jam

Probably "by" 59%. It is true that when there are more choices there is less of a conversion rate in sales. Studies have shown that when there is 3 types of jam on an endcap at the supermarket more total jam gets purchased than when there are 7 choices on the same endcap.