VI. Five types of Behavior that are Observed

Cost Environment

  1. The larger the standard deviation the more likely it is stolen;
  2. Prices below MSRP or cost; and
  3. Prices fluctuate per sale or buyer

Feedback Manipulation

  1. Low dollar items listed in first 15/30 days of account creation;
  2. Similar buyers and sellers in the first 30 days of feedback

Duration and IDs

  1. Changes User IDs frequently;
  2. Often changing personal names to business names; and
  3. Often changing account several times over a year

Buying and Selling Activity

  • Normal buying activity and selling activity then it starts

Multiple of the same items for sale (high demand)

  • No longer household items but brand new items for sale

System for Evaluating a Suspect’s Behavior

  • Low dollar starting prices ($.01-$5.00) but the main point is it’s listed below cost;
  • One-day duration of listing;
  • Patterns in feedback that exhibit hidden accounts;
  • Large standard deviation in items final selling value;
  • Changes in User ID; and
  • Grouping similar products instead of up sales, and add-ons to increase the benefit

Note: There is no single behavior that is always indicative of fraud

Concerns in Interpreting Behavior; Incorrectly interpreting the behaviors of fraud

  • Identifying signs of feedback manipulation;
  • Understanding the cost of goods;
  • Duration of listings;
  • Identifying an illegitimate business environment; and
  • Not clearly establishing other fraud behaviors


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