A technical cofounder should get as much equity as he or she is able to negotiate. Technical cofounders end up feeling burnt - or walking away from opportuniti

A technical cofounder should get as much equity as he or she is able to negotiate. Technical cofounders end up feeling burnt - or walking away from opportunities feeling like non-technical cofounders are completely delusional jerks - because they don't have as much experience negotiating. When that non-technical cofounder puts an offer of 10% or 20% on the table, he might just be an idiot, but he might be expecting you to press back hard with a counterproposal because that's what he would do in this situation. Instead of working out formulas which will allow you to justify why your equity is what it is, learn to negotiate. The best book I've read is Roger Dawson's 'Secrets of Power Negotiation'. Then, practice.