Which financial indicator measures the ratio of sales to fixed assets?

A marketing manager wants to build a strong relationship with the customers and to customize message without high costs. He understands that relationship building and message customization would require constant updating the database due to the reliance on CRM. Based on the manager's consideration, ____________ will be the most appropriate promotional form.

A. Personal selling B. Direct marketing and interactive marketing C. Sales promotion D. Advertising E. Public relations

Are the generic business-level strategies of differentiation and cost leadership incompatible? Explain