It is important to know the factors that affect your CPC metric in order to fix any potential problems with your campaign:
Bid Strategy
Having the right bid strategy is important in the performance of your PPC campaign and effects if your CPC is high or low. Bidding is basically an action for ad space based on chosen keywords. If others have placed bids on the same keywords as you have, the ad auction kicks off with the goal of determining who gets the ad space based on each bidders ad rank, or positioning by using a formula looks at both maximum bid and quality score. Using a max bid is how much you're willing to pay every time someone clicks your ad. You'll have to place a realistic max bid if you want to win over ad space from other advertisers.
Quality Score
Google assigns a quality score between 1 and 10 to every advertisement. Your quality score depends on three factors — ad relevance, landing page experience, and ad click-through rate. That score is multiplied by your bid to find your rank in the ad auction. If you have a high quality score, you can end up paying less to earn a top ad position.
Ad Rank
Google calculates ad rank and uses it to determine the placement of your ad in search engine results, or if your ad will appear at all. Google calculates this metric using your bid amount, your ad quality at auction, ad rank thresholds, the context of a search query, and the anticipated impact of ad extensions.