Investors are showing concern about Samsung's earning momentum. The mobile division generates 50% of profit and competition in intensifying in this field. Samsung shares declined by 4.6% on Jan 2, 2013. Overall operating profit is expected to increase in the 4th quarter 2013 by 9.2% from prior year, compared to 26% in the 3rd quarter 2013. The operating profit for the mobile division is expected to be up 14% over prior year for 4th quarter 2013, declining 8% from the third quarter. The less premium smartphones make up a greater proportion of the portfolio reducing margins. Prices are being lowered by competitors. Motorola Mobility is cutting the price of its Moto X smartphone to $399 from $550, much cheaper than the Samsung Galaxy S4 smartphone costing $600 without a contract in the U.S. market. Declining TV prices with competition from Vizio and other Chinese competitors is likely to squeeze margins in this segment.