Put-call parity is an important concept in options pricing which shows how the prices of puts, calls, and the underlying asset must be consistent with one another. This equation establishes a relationship between the price of a call and put option which have the same underlying asset. Is On the right hand side, you have the call option is trading $8. And then the bond is trading at $30. So this combination is trading at $38. So even though they have the exact same payoff at option expiration, the call plus the bond is cheaper than the stock plus the put. If put-call parity doesn’t hold, there will be arbitrage opportunities. Example Suppose S 0 = 31 EUR, K = 30 EUR, T = 3 months, r = 10% p.a., c = 3 and p = 2:25 EUR. Then portfolio A: \one call and cash Ke rT is worth c + Ke rT = 32:26; while portfolio B: \one put and one share" is worth p + S 0 = 33:25: We have A