Newman's math reveals that while 64% of the Samsung Galaxy S III used Samsung parts, 68% of the Samsung Galaxy S4's parts come directly from the Korean manufacturer. Those extra percentage points represent money flowing to Samsung's bottom line. That should more than make up for the 2% difference in gross margin between last year's model (48%) and the soon to launch new model of the phone (46%). That calculation is based on an average selling price of $520 for both handsets.
Newman also points out that with 10 million units of the Samsung Galaxy S4 being produced each month, the OEM is churning out more phones monthly than Bernstein had estimated. Overall, the analyst says that "We believe the Galaxy S4 positions Samsung Electronics for continued strong earnings growth this year."
source: Barron's via AndroidCentral