When online retailing first went mainstream, one of the best things it offered was an end to the need to drive from store to store to compare products and prices. Just a few quick clicks and shoppers knew if they had a dud or a deal on their hands.

Well, that didn't last long.

While the shopping experience improved, so did the technology. Now retailers know who visits their sites, where they came from, what items they perused in the past, and what device is being used to browse the virtual aisles.

All of that information allows businesses to tailor their product offerings and prices to each individual shopper -- and not always to the consumer's advantage.

Yes, you may be paying more than your neighbor for the same products from the same store. In fact, your neighbor may be getting presented with different products than those promoted to you.

What Price Will You Pay?

Online retailers use consumer data to determine product offerings and price points in a number of ways.

A recent article in The Wall Street Journal showed how Staples (SPLS) and Home Depot (HD) present different prices for identical products based on the consumer's ZIP code. Those who lived more than 20 miles from a Staples competitor were served higher prices more frequently (67 percent of the time) than those who lived within 20 miles of a rival (who saw higher prices just 12 percent of the time). Presumably, the longer the drive to a competing store, the less likely a shopper was to go out of the way for a better price.

In another article on the topic, the Journal pointed out that after Orbitz (OWW) learned that Mac users spend more on hotels, the online travel company started to respond to their queries by presenting them with costlier options than Windows users were served.

Some consumers are concerned that this is only the beginning of the trend. Amazon.com (AMZN) users will have long since noticed the company presenting them with recommendations based on their past purchases and searches. Now, there are concerns that businesses will start snooping even further to try to determine a person's financial situation (say, by the brand of computer being used, or the ZIP code you're shopping from) and basing the price of products on their perceived wealth.

How It Works

So how exactly do retailers know so much about you? Let us count the ways. Online retailers can:

1. Get a rough idea of where you live by associating your device's unique IP address with your physical location.

2. Detect what kind of device you're using to access their websites by noting the "User Agent String" attached to each Web-enabled device.

3. Track the purchases you make on their website. For example, your Amazon.com account keeps a record of the purchases you've made.

4. Record what you've searched for on their websites by loading cookies onto your computer when you visit their websites. In addition to documenting how many times you've visited their websites, some cookies can track which links you've clicked on. In addition to using cookies, businesses can monitor consumers' search queries by associating your searches with your user account, or even by associating your query terms with your IP address.

5. Purchase information from third parties about consumers' past purchases and Internet searches.

Together, these methods provide businesses with a powerful tool for determining which of their products you might be interested in -- and how much you might be willing to pay for them.

Is This Really So Bad?

Some consumer advocates argue that these pricing strategies are bad for consumers because it's nearly impossible for them to tell when, or why, they are being offered different deals than other consumers. Also, the Journal notes that those receiving discounts through Staples tended to have higher incomes than those who didn't, which raises concerns of discriminatory pricing.

On the other hand, forcing companies to cease these practices could result in an overall reduction in the number of discounts. For example, Staples' alleged practice of offering lower prices to consumers living closer to its competitors is likely an attempt to use discounts to compete more effectively in areas dense with stores offering similar products. If Staples couldn't use that strategy, it's possible that all consumers would be forced to pay the higher price.

Weigh in

How do you feel about online retailers using consumer data to customize deals? Chime in below!

Motley Fool Contributor M. Joy Hayes, Ph.D. (@JoyofEthics), is the Principal at ethics consulting firm Courageous Ethics and has no position in any stocks mentioned. The Motley Fool recommends Amazon.com, Apple, and The Home Depot. The Motley Fool owns shares of Amazon.com, Apple, and Staples.

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What info does your credit card provide retailers, I can see them being in position with spilling to retailers when and how much you will pay. Everyone is collecting data on your trends/habits these days.

January 28 2013 at 7:40 PM Report abuse rate up rate down Reply
Douglas Hom MD

If you don't want data gathered about you, then avoid using online shopping. Businesses have always used what data that could be gleaned to appeal to specific regions and demographics. This is no difference except that it is very egalitarian (everyone is watched) and can be incredibly individualized. There are programs that scour other sites for price comparisons and these are not computer or zip code restricted or embellished.

January 25 2013 at 6:34 AM Report abuse rate up rate down Reply

nothing like committing retail suicide..

January 24 2013 at 1:27 PM Report abuse rate up rate down Reply

Where's the FTC. Looks like classic price fixing.

January 24 2013 at 12:00 PM Report abuse rate up rate down Reply

I don't think there is anything wrong with the business practice. From a consumer point of view, if it turns out that the quoted prices differ by a few dollars here and there, nothing will really change, but if the quotes vary substantially then consumers will figure out ways (with help from other businesses) to camouflage themselves!

January 24 2013 at 7:13 AM Report abuse rate up rate down Reply

Well...any site can put whatewer he like for price and top of that can ''follow'' my purchase history or stuff I like to buy a most, can track everything at all abot me.....BUT if that sites don't have good price for MY pocket doesn't matter what will offer me or where is located I will not buy it....

January 24 2013 at 4:03 AM Report abuse rate up rate down Reply

On the surface of it, this seems to be a classic violation of the Sherman Anti Trust Act.

Talk about a great class action law suit in the makeing------------

January 24 2013 at 12:46 AM Report abuse rate up rate down Reply

I agree with Scottilla. If you think it's a good buy, go ahead and do so. I find all the tracking and info tabbing to be disturbing and regularly clean out any cookies. If shopping on line, it is a good idea to use different computers/tablets (if you have them) to check for the lowest prices.

January 23 2013 at 3:59 PM Report abuse +2 rate up rate down Reply

If it's a bargain, you buy it. If it's not, you don't.

January 23 2013 at 2:21 PM Report abuse +2 rate up rate down Reply

This is why I dont shop online at all

January 23 2013 at 1:10 PM Report abuse +1 rate up rate down Reply
1 reply to C's comment

Then you're only cheating yourself. I save way more online than shopping in stores. Broaden your horizons.

January 24 2013 at 12:56 AM Report abuse +4 rate up rate down Reply
1 reply to Rhianon's comment

and yet you can't read,, they are going to CHARGE YOU ONLINE SHOPPERS MORE.

January 24 2013 at 1:29 PM Report abuse rate up rate down