Hello, thanks for asking though not too clear about the question but will give a better answer to my best knowlegde.
If its about what business should ECA whom you'll be referring should be involved in, I'd say any business accepted by SFI. Check here http://www.tripleclicks.com/ECA/Guidelines.php to see what products your ECA's must be selling. So long as they are not selling any restricted product you have unlimited widths to recruiting them as ECA. This is how best I can answer, good luck.
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Some the best businesses would be the business that already has an online platform or a business that is transitioning to sell online. It helps that they are already internet literate and understand the benefits of connecting to the world. Its very lucrative to deal with people who are already familiar with this environment.
I should say any type of business where the products can be delivered without too much shipping expenses.There is no rule what can be bayed from someone.Targeting only one type of business make your possibilities limited.There is one thing that you need to pay attention to all those Eca`s are practically your stores here at TripleClick so I would recommend to not limit yourself in recruiting.
Although there are ECAs all over the world you would need keen and persistent advertising and marketing to be successful recruiting any of these ECA’s. The best and most ideal focus group are the businesses within your own city, country, or region. Some products can also be picked up at a local store or shop thus eliminating the shipping and handling cost.
I do not think there is a general best type of business. i think you should search after the ones which want to develop online marketing for their products, first the ones which are also searched in your geographical area, then the ones which are searched abroad. Also, maybe you should pay attention primarily to the health sector and to the food and ambiental ones. But this is not a rule...What should one do with a cup of coffee if he/she needs an e-book about cars ?
"What are the best types of businesses to focus on to maximize ECA recruitment?"
There are or there is no specific business to focus on to maximize ECA. It all depends on an individual as to what he wants to offer or sell. Go to Tripleclicks in the ECA column and from there will emerge many ideas.