How does rETH increase in value?

Could you please elaborate on how the value of rETH appreciates? I'm curious about the underlying mechanisms that drive its growth. What are the key factors that contribute to its increasing worth? Is it primarily market demand, or does it have something to do with the performance of the underlying asset? Also, how does rETH's value correlate with other cryptocurrencies or traditional financial assets? I'd appreciate a detailed explanation of this process.