Sami is not often invited to parties.

Sami is a hard partying college kid.

Young boys learned much about civic life by accompanying their fathers to religious and political functions, including the Senate for the sons of nobles.

Likewise, in markets without many investors, not enough trades can be executed to generate the returns needed to attract them. As is often true of great parties, it can be a bit of a mystery how substantial new markets get started, but we know that it does happen from time to time.