Describes the rate at which business proposals and investment pitches are being received by a firm. 
Inbound opportunities may come from pre-existing networks or relationships, word-of-mouth within the startup community, investor referrals, proactive research, conferences and events, or old inreach from the web, social or professional networks.
Dealflow to investment ratios vary widely by geography, market segment, stage and channel. A typical US-based VC firm will see approximately 100 deals for every investment.