Sloth Makes All Things Difficult

In economic terms, productivity is a measure of output. Or it can be "the process of creating material values, whether goods or services." Or it can refer to the process of earning something through the creation of something of value. But at bottom, for a any thing to be properly considered productive, it must be profitable: the cost of its production must be less than the value it achieves. This is why billing an hour is productive and writing this post is not.