There is still room to say that the effect does not occur as a result of the cause, but this is considered not very probable.The following is an example of a deductive market research approach that seeks to measure differences in online purchasing behavior and use of website shopping carts:General Cause The purchasing behavior of Internet shoppers who regularly place items in their online shopping cart but do not complete many purchases differs from the purchasing behavior of Internet shoppers who do not use the cart to hold items they never buy.Specific Effect Internet shoppers who habitually place items in their online shopping carts but do not complete the purchases are 75% more likely to return to the same websites and complete a purchase within 7 days.Research Finding Retaining the online shopping cart contents for 10 days when a consumer leaves a website before completing a purchase is good business, and means a high probability of future purchases by that consumer on the visited website.Hypothesis - A Tentative AssumptionA hypothesis is a tentative assumption in the form of a statement or a question that a research effort is designed to answer.

Do you think they will still have presence in 10-15 years with the increase in online shopping?  

Personally for my DIY projects I tend to do some online shopping.

If online shopping is an option for you, I'd also check out wayfair.com (Sign up for their professional or equivalent account), hostgpo.com and Minoan as well. 

With online shopping, Amazon Prime delivery, etc., there is a continuing decline in demand for retail space.

An analysis by the investment firm UBS shows online shopping will grow to 25% of all retail sales by 2025.

Online shopping is gutting retail sales.

It was pretty cool and a little scary at the same time that I was able to add a house to my online shopping cart without ever stepping foot on the property! 

@Aaron K.Thank, I hope it will come to me while online shopping and going to open houses, etc. 

A quality solar installer that does any amount of volume will be able to provide better quality equipment to you for less than you would be able to buy low quality equipment for from any of the "direct/wholesale" online shops, as those sites typically only sell poor quality "kits" at not so great prices for what you get.