You can check out above graph to see how the market cap of PeerCoin has changed over time. The market cap value depends on the value of PeerCoin on that particular day and number of PeerCoin in supply at that day.

How is PeerCoin Market Cap calculated?

The PeerCoin Market cap is calculated using a simple formula. You can find it below:

PeerCoin Market Capitalization in USD = Number of PPC in supply X Price of one PeerCoin in USD

Since the price of PeerCoin is highly volatile you can see the market cap going up and down a lot. Sometimes price and market cap are not linear to each other due to increase in the supply of coins in the market and stable or decrease in the price of the coin. So you can say that it's not simple to predict the market cap of PeerCoin or predict the price of PeerCoin.