Alpha Bank, Greece's fourth-biggest lender by assets, said on Friday it had agreed to buy Citibank's loss-making class="mandelbrot_refrag"> retail operations in class="mandelbrot_refrag"> Greece for 2 million euros ($2.72 million), the latest deal in the sector's consolidation. Greece's debt crisis has hammered its banking industry, prompting foreign players, including Credit Agricole, Societe Generale and Portugal's Millennium bcp , to sell local units to Greek lenders in recent years. true Hit by a sovereign debt restructuring and rising loan impairments during a deep six-year economic slump, the industry has consolidated down to four big players after a wave of acquisitions and the winding down of non-viable banks. The fortunes of National, Piraeus, Eurobank, and Alpha, which now control more than 90 percent of the banking market, have begun to improve after two recapitalisations and regained capital market access. On Fr