Yes, only a small number of companies produce memory because of capital requirements and complexity. When prices go up both of those things become less of a problem for investors who can see better return for lower risk on that high capital investment. They will then invest in production to capture those returns. This is literally the exact reason Samsung are doubling supply of this particular type of memory.
There is no monopoly on computer memory.
Yes, only a small number of companies produce memory because of capital requirements and complexity. When prices go up both of those things become less of a problem for investors who can see better return for lower risk on that high capital investment. They will then invest in production to capture those returns. This is literally the exact reason Samsung are doubling supply of this particular type of memory.
High prices will fix the shortage.