I find the following instance very convenient:<div><br></div><div>------------------------------------------------------------------------</div><div>import Data.Monoid</div>import Control.Applicative<div><br></div><div><div>

<div>instance Monoid a =&gt; Monoid (ZipList a) where</div><div>  mempty = pure mempty</div><div>  mappend = liftA2 mappend</div><div>------------------------------------------------------------------------</div><div><br>

</div><div>Any reason why it is not in the standard library?</div><div><br></div><div>Thanks,</div><div>Vladimir</div></div></div>