Dollar General, the largest dollar-store chain in the United States, offered to pay USD 78.50 per share in cash for Family Dollar, the country's second-largest deep discounter, in a deal valued at USD 9.7 billion.
Dollar General said the combined company with Family Dollar would have nearly 20,000 stores in 46 states and sales of more than USD 28 billion.
In July Family Dollar agreed to be acquired by Dollar Tree, the third biggest dollar chain, in a cash-and stock deal valued at USD 9.2 billion, including debt, with Dollar Tree paying USD 74.50 per share.
"For Dollar General shareholders, the proposed combination of Dollar General and Family Dollar would be a significant strategic opportunity to create immediate and lasting shareholder value," said Rick Dreiling, Dollar General's chairman and chief executive.
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The customers of both companies would also benefit because "we would be able to provide better value and greater selection," he said.
If a merger agreement is reached, Dreiling, who previously had announced his retirement, would remain in his dual roles in the combined company until May 2016 to oversee the integration, the Goodlettsville,Tennessee-based company said.
The chain had been under pressure to put itself up for sale from activist investor Carl Icahn, who bought a stake in the company in early June.
Shares in Dollar General jumped 11 percent to USD 63.79 in pre-market trade today. Family Dollar was up 4.8 at USD 79.69; Dollar Tree fell 1.9 percent to USD 54.57.