The current trend toward corporate focus reverses the diversification trend of the late 1960s and early 1970s. This article examines the value of diversification when many corporations started to diversify. The author finds no evidence that diversified companies were valued at a premium over single segment firms during the 1960s and 1970s. On the contrary, there was a large diversification discount during the 1960s but this discount declined to zero during the 1970s. Insider ownership was negatively related to diversification during the 1960s but, when the diversification discount declined, firms with high insider ownership were the first to diversify.

[We compare acquisitions completed with and without investment bank advice over the 1981 to 1992 period. We find that the choice to use an investment bank depends on the complexity of the transaction, the type of transaction (takeovers versus acquisitions of assets), the acquiror's prior acquisition experience, and the degree of diversification of the target firm. Although acquisition announcement returns are lower for firms using investment banks, this difference can be explained by differences in transaction characteristics. These results suggest that transaction costs are the main determinant of investment banking choice, followed by contracting costs and asymmetric information costs.]

The current trend toward corporate focus reverses the diversification trend of the late 1960s and early 1970s. This article examines the value of diversification when many corporations started to diversify. I find no evidence that diversified companies were valued at a premium over single segment firms during the 1960s and 1970s. On the contrary, there was a large diversification discount during the 1960s, but this discount declined to zero during the 1970s. Insider ownership was negatively related to diversification during the 1960s, but when the diversification discount declined, firms with high insider ownership were the first to diversify.

The current trend toward corporate focus reverses the diversification trend of the late 1960s and early 1970s. This article examines the value of diversification when many corporations started to diversify. I find no evidence that diversified companies were valued at a premium over single segment firms during the 1960s and 1970s. On the contrary, there was a large diversification discount during the 1960s, but this discount declined to zero during the 1970s. Insider ownership was negatively related to diversification during the 1960s, but when the diversification discount declined, firms with high insider ownership were the first to diversify.

We compare acquisitions completed with and without investment bank advice over the 1981 to 1992 period. We find that the choice to use an investment bank depends on the complexity of the transaction, the type of transaction (takeovers versus acquisitions of assets), the acquiror’s prior acquisition experience, and the degree of diversification of the target firm. Although acquisition announcement returns are lower for firms using investment banks, this difference can be explained by differences in transaction characteristics. These results suggest that transaction costs are the main determinant of investment banking choice, followed by contracting costs and asymmetric information costs.