For new managers with limited investing experience, the fund size should be $5 MM to $10 MM in the developed world and $2.5 to $5 MM in the developing world. If a new manager has extensive angel experience with strong returns or venture experience dealing with limited partners, then the fund size can be up to twice that size, ranging from $10 MM to $20 MM and $5 MM to $10 MM respectively. 

For emerging managers on Fund III or Fund III, the next fund size can be 1x, 2x or 3x the previous fund size. If the returns from previous fund or funds are exceptional, an emerging manager can consider a fund size as large as 5x the previous fund size. 

The goal of any manager is to have a target fund size that they can easily hit or exceed. It is very difficult to recover from raising less than your target fund size. Conversely, oversubscribing is lolled at favorably by all parties. 

If a manager can not quickly raise 15% to 20% of the fund size from friends and confidants, then the fund size is too large.