On Sat, 12 May 2007, MIG wrote:

On May 12, 3:05 pm, James Farrar wrote:
On 12 May 2007 06:47:31 -0700, MIG
wrote:

If you really think that collecting data for subsequent mining is too
much trouble, why do you suppose they have supermarket "loyalty"
cards?

For collective data, not for data on individuals.

No, they could get collective data from the till records (eg buying beer
and nappies together). The purpose of loyalty cards is to get long term
data about individuals' patterns of purchases.

Most people pay for their shopping with credit or debit cards. I've long
wondered why they didn't just use the numbers of those to track people.

tom

--
information distribution, vox humana, deviation, handle, feed, l.g. **