Zcash developer Shielded Labs has introduced a proposal for a dynamic fee market to tackle increasing transaction costs and network congestion. The plan suggests moving from Zcash's current static fee model to a dynamic system that calculates fees based on the median fees per action over the last 50 blocks. Additionally, it includes a temporary priority lane for transactions with higher fees during periods of congestion. This proposal aims to preserve user privacy while accommodating the growing ZEC price and user activity.