Preparation Words and sentences 5. Para. 23. L1 Modern marketing rests on the "marketing concept: the idea that firms should seek to discover and then to satisfy the needs of their customers rather than to concentrate on convincing prospects to purchase existing products or services rest on: be supported by be based on prospects: chances of being successfulPreparation Words and Sentences 5. Para. 23, L1: • Modern marketing rests on the “marketing concept”: the idea that firms should seek to discover and then to satisfy the needs of their customers rather than to concentrate on convincing prospects to purchase existing products or services. • rest on: be supported by; be based on • prospects: chances of being successful