Marketing can be free. For example, you can market on social media and it does not cost you any money. If you have an email list under 2k subscribers, you can do email marketing for free. If you can do your own SEO, it is also a free marketing. But the question is how effective free marketing is? I mean does free marketing really work? Well, the answer depends on how well yo are doing it and how big is your audience. if you have very small audience (social media followers, email list), free marketing can be just a waste of time. What do you think?