Are Shudras required to perform Shraddha ritual? Or is the Shraddha ritual only meant to be performed by the first three varnas (Brahmin, Kshatriya and Vaishya)?

Is there a system to predict the value of futures, options, stocks, mutual funds and other such securities through Jyotisha Shastra? As Hora Shastra part of Jyotisha Shastra deals with timely predictions, can anything be said about the securities related to a particular company or companies? Than...