Hi, my name is Nancy, and today I am going to continue our cost accounting series by explaining the difference between fixed costs and variable expenses. Now before we go any further, I need your help. You see, presently, this channel does not receive any advertising revenue from YouTube. YouTube requires 1,000 subscribers and 4,000 watch hours to earn ad revenue. My YouTube analytics is telling me that 95% of my viewers are not subscribers. It does not cost anything to subscribe to the channel.