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In 1970's these revolutions in corporate finance lead to the development of portfolio planning by Boston Consulting Group (1970). Soon, portfolio planning became famous in corporate sectors and according to the survey of Haspeslagh (1982) by 1979, 45 percent of the Fortune 500 companies were using portfolio planning in some form.

However, with the passage of time problems related to portfolio planning emerged. As Goolds and Luchs (1993), argued that the corporate manager with long experience of particular sector of the industry found extremely difficult to manage their newly acquired businesses in vibrant and unfamiliar sectors. Consequently, this affected the performance of new acquisitions or mergers of the firms. In search of solution to this problem Hamermesh and White (1984) found that administration was a vital factor in explain business performance of mergers or acquisitions but many organizations incorrectly addressed the approach.

The Fourth Wave, 1981-1989:

The decade of 1980's seen another merger wave in business world. In this period, merger deals were frequent and larger and total value of mergers were approximately $.13 trillion in US (see Sikora, 1995).

This was influenced by service sector and significant support from investors; lenders and globalization facilitated companies to finance the buyout deals (see Sikora, 1995). Moreover, the reasons of the fourth merger wave were excess capacity (see Jensen, 1993), agency problems (see Jensen, 1988), market failure (see Shleifer & Vishny, 1997), and tax and antitrust law changes (see Bhagat et al, 1990).

It seems that during 80s, diversified firms do not have capacity to create values therefore companies start re-thinking about role of corporate management as well as appropriate strategies for diversified firms. As highlighted by Goold and Luchs (1993) highlighted that in order to survive firms cut back costs and scale down their staffs but these were not adequate to create value. Furthermore, they argued that diversification strategies failed to create value for many businesses. Nevertheless, these failures compelled senior managers to transform their primary goals to creating shareholders' values instead of building huge businesses (see Porter, 1987).

Moreover, management of the companies started evaluating corporate performance like stock market by using economic indicator instead of accounting measures and take whatever steps were essential to enhance the value of their firm's stock (see Goold and Luchs, 1993). However, value based planning based on financial tools of Return on Equity (ROE), internal rate of return and discounted cash flow provided different views to managers about competitive advantages and stock prices (see Rappaport, 1986). Further, Goold and Luchs (1993) pointed out that a higher stock price could be a reward for creating value.

However, during the era of 80s firms that did not diversify into unrelated businesses and specialize into their core industry were able to create value and turn out to be successful companies (see Peter and Waterman 1982). Mintzberg and Lampel (1999) also support this not本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。