lack of components

Retina MacBook Pro 13 inch is slow to launch because of difficulties in production
the production of high-resolution screens on a 13-inch size is too low, making apple constantly back in time for product launches.
Lack of components because demand for ultra-thin notebooks increased
in the context of ultra-thin, ultra-light ultrabook computers initiated by intel is still difficult to sell because the price is too high, notebook manufacturers have created a new way of creating ultra-thin notebook models like ultrabook, but still have affordable prices at acceptable levels.