Alyssa provides a pool service. The chemicals she uses are more effective and more environmentally friendly than her competition's chemicals, but they are more expensive: $5 per pool service versus $3.50 for her competitors. On the other hand, she only needs to service pools every other week, while the competitors have to service pools weekly. Her competitors charge $30 per service which includes the chemicals they use. 

How is the EVC for Alyssa's pool service?