Think of our discussions on inventory$/$working capital management. Answer the questions below. $($Be sure to show professionalism in your tone$/$grammar$.)$

What did so many companies move to a Just$-$In$-$Time model in the first place? What are the major advantages $($at least three$)$ of Just$-$In$-$Time inventory?

What are at least three of the now$-$apparent problems with this model?

How would a move to a "just$-$in$-$case" model affect product costs for companies?