of the BCG model. The BCG model is criticised for having a number of limitations (Kotler 2003; McDonald 2003):
There are other reasons other than relative market share and market growth that could influence the allocation of resources to a product or SBU: reasons such as the need for strong brand name and product positioning could compel resource allocation to an SBU or product (Drummond & Ensor 2004).
What is more, the model rests on net cash consumption or generation as the fundamental portfolio balancing criterion. That is appropriate only in a capital constrained environment. In modern economies, with relatively frictionless capital flows, this is not the appropriate metric to apply – rather, risk-adjusted discounted cash flows should be used (ManyWorlds 2005).
Also, the matrix assumes products/business units are independent of each other, and independent of assets outside of the business. In other words, there is no provision for synergy among products/business units. This is rarely realistic.
The relationship between cash flow and market share may be weak due to a number of factors including (Cipher 2006): competitors may have access to lower cost materials unrelated to their relative share position; low market share producers may be on steeper experience curves due to superior production technology; and strategic factors other than relative market share may affect profit margins.
In addition, the growth-share matrix is based on the assumption that high rates of growth use large cash resources and that maturity of the life cycle brings about the expected profit returns. This may be incorrect due to various reasons (Cipher 2006): capital intensity may be low and the business/product could be grown without major cash outlay; high entry barriers may exist so margins may be sustainable and big enough to produce a positive cash flow and a growth at the same time; and industry overcapacity and price competition may depress...
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