MedNet.com faces challenges to its revenue model from a competitor called Marvel. MedNet generates most of its revenue from advertisements using a cost per impression (CPM) model. However, Marvel uses a pay per click (PPC) model where advertisers only pay for clicks, not impressions. This is causing MedNet's largest advertiser, Windham Pharmaceuticals, to consider shifting ad spending to Marvel. If MedNet loses Windham's business or has to change its revenue model, it could lose a major source of revenue. Strategic options for MedNet include taking a more diagnostic approach to visitors, charging for content subscriptions, expanding offerings and languages, and improving customer relationships to maintain trust and integrity.