A 10 percent increase in MacBook shipments is expected in the third quarter of 2013. Apple can ship an estimated amount of 4 million MacBooks in 3Q13. DigiTimes reported according Apple's Taiwanese supply makers that the shipments rate will though increase in 3rd quarter, but decreased according to last year.
Normally 5-6 million units were shipped during third quarter every year. Due to yearly closings, shipments were always increased and third quarter is marked as the peak sales time of the year. But this year, expected amount is far less than previous year's actual shipments.
This decreasing trend can be a result of new 13-inch MacBook Pro. Apple released new model in 2012 to get more sales but it did not meet expectations. As a result, Apple shortened supply and suspend orders in first quarter 2013. Apple also adds up new supplier in order to improve sales. May be this could help Apple to gain more sales.