Resource-constrained early-stage startups often default to content marketing since it is essentially free. However, there are instances when paying for customers makes a ton of sense. The principal challenge being that it’s very difficult to find a channel and tactic that is both effective and economical. In some cases, it might be next to impossible to measure the effectiveness of your marketing spend, forcing you to fly blind. In this article, we will discuss common paid advertising activities and channels as well as tactics for measuring and optimizing your campaigns.