What does "critical dimension" mean? In what circumstances could I use it?

Native speaker’s answer
Rebecca
"Critical dimension" here means something like "crucial aspect, critical point." He's basically introducing his second important point, which is the behaviour of banks. You can use similar phrases like "crucial point, critical aspect, critical dimension" when you want to explain a key point about something. Ex: The next critical dimension of this theory is about economic stimulus. Ex: A crucial aspect of this book is the emphasis on forgiveness.