What’s the best way to negotiate with an investor?

Paul Graham (Co-Founder & Partner at Y Combinator)
How to Raise Money

Another advantage of having one founder take fundraising meetings is that you never have to negotiate in real time, which is something inexperienced founders should avoid. One YC founder told me: Investors are professional negotiators and can negotiate on the spot very easily. If only one founder is in the room, you can say “I need to circle back with my co-founder”