VERBATIMS

In which product/service category is it
most difficult to measure marketing results?
For any product category it depends upon the method of "promotion/advertising".
restaurant
intangible services such as electricity or water, because customers in many areas can't choose between suppliers
power tool accessories
travel
Services/Consulting
IT
Service Related Businesses
tourism/travel
Seasonal Items
marketing services
all
Non-profit
prepaid services
B to B services
travel & tourism
Categories like tourism, where you can't control the quality of the product.
don't know
publishing

services

consumer electronics
Services
professional services
b2b
biz to biz
energy
paper
services
professional services
chemicals
quick service restaurants
jewelry
financial servies
all are measureable
consulting
Service Organizations
hospitality & tourism
engineering
business automation software
media content