<i>&gt; There&#x27;s a positive externality that arises from price-sensitive shopping.</i><p>The term &quot;price sensitive&quot; is a bit misleading. A better term would be &quot;value sensitive&quot;. Your duty as a free market participant (I prefer that term because &quot;free market&quot; is not necessarily the same as &quot;capitalism&quot;) is to get the best value you can for your money. But that is value <i>to you</i>, and will be different for different people. Also, that value has to include the cost of the time and effort you spend searching for value, which is also different for different people.