Highlights Think of undifferentiated pleoimorphic sarcoma as a differential in older adults with a history of radiation therapy. It is important to discover the type and grade of the tumor. Patients should be thoroughly worked up for the best possible outcome.

Achieving a successful market entry on a network effect market is a great challenge. The pre-existing customer base of competitors will usually force a new supplier to concede in order to entice other companies' customers away and to compensate for network effects. The cell phone market shows a special form of network effects that arises from different pricing for on-net and off-net calls. Simulation models can help to estimate consequences of pricing strategies for different components of a cell phone contract even prior to market entry.

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