One of the most important parts of running a business, be it a bar or restaurant, is getting people in the door. To attract potential customers, you'll need to spend some money on marketing. Marketing helps to expose your business to a larger audience, ultimately enticing them to spend money. That being said, it is important to understand the effectiveness of marketing efforts to determine what to spend. Ultimately, you'll want to look at your return on investment, or ROI. You'll want to look at the amount of customers you are getting and the revenue you are earning, among other things, to better understand how your marketing campaign is working. There are a number of ways to track your ROI on marketing.