Please design a power system with the following parameters: For a simple power system (e. 3-bus, 2-bus networks), definitely no more than 4-bus...

Please design a power system with the following parameters:

• For a simple power system (e.g. 3-bus, 2-bus networks), definitely no more than 4-bus system.
• Figure out a case that nodal prices could be negative even when all bids/MCs are positive
• NO simulation
• Calculate the prices by hand (using a SIMPLE system)
• Explain why negative prices happen