Who should prepare the marketing plan is it enough for one person to prepare it? What type of companies needs marketing plan for example Investment Company needs a marketing plan?
All businesses need a marketing plan: it is the foundation for sales (without marketing planning, sales can be a scattered effort).
Yes an Investment Company needs a marketing plan: what's the market segmentation, target market, product differentiation, product life-cycle, promotion plan, pricing strategy, distribution program and so much more.