&gt; I&#x27;m not sure why people are having so much trouble with this question, which can easily be restated as &quot;why can&#x27;t someone build a laptop that has at least as good a display as what Apple calls a &#x27;retina&#x27; display while having the same battery life as an rMBP?&quot;<p>After the first, short paragraph addressing the strict issue with &quot;retina&quot;, the longer, second paragraph of the grandparent post directly answered why that would be the case: competing on different feature trade-offs rather than making the same trade-offs and competing on price allows greater profits because it avoids entering a market with direct substitutes, even if doing so in a way constrained by the trade-offs earlier entrants have made results in entering what is effectively a <i>smaller</i> market without direct substitutes instead of a larger market <i>with</i> direct substitutes.