&gt; Assuming the &quot;economy&quot; pack is the only offer you visit a distinct store for and the good is perishable (so that stockpiling doesn&#x27;t work), then it might be cheaper if you factor in the time you need to reach said store, shop there and get back home into the &quot;cost&quot;.<p>I&#x27;m actually referring to same-store, same-time prices when neither the economy nor the smaller pack is specially discounted, so the travel, etc., cost is the same.<p>Stockpiling&#x2F;perishability doesn&#x27;t seem relevant in any way that favors economy packs -- an economy pack is either a larger single sealed pack (in which case, with most perishable goods -- which go bad faster once opened -- is strictly more problematic than stockpiling smaller packages with the same aggregate contents) or is itself an aggregate of smaller packages (in which case, its equivalent to stockpiling smaller packages.)<p>The only place I can see the convenience issue you raise being a factor is if one store <i>only</i> sells the economy pack and another store sells the smaller pack, and there is a convenience difference between the two stores. Then, there is a premium for the convenience of the <i>store</i>. But that kind of different-store scenario is not what I&#x27;m referring to.