In the future does effective regulation require greater cooperation between sovereign states to ensure an ‘even playing field’?

The whole question is referencing to the financial banking crisis. Explain why some banks have failed, and from an economic perspective whether in the future a failing bank should be allowed to fail or be saved.
Explain whether the current legal regulation of the banking system is effective. In the future does effective regulation require greater cooperation between sovereign states to ensure an ‘even playing field’? I only need the last question because it is a group work and this is what i need to do.

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