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Here's the image of a money market with two different money supply and demand curves:

enter image description here

Here are some questions regarding money market reactions. I'll always write my proposed reasoning underneath each questions, with a summed up answer at the end of the paragraph, and I need you to check if it's correct.

1) There's a GDP increase and no monetary policy was implemented. Is a movement from point $A$ to $C$ or $D$ to $B$ a logical reaction?

The LM curve formula is $L(Y,i) = Money Demand/Price Level$ If the government has set the money supply to $M_B^S$ and we're in point $A$, then the reaction $A$ to $C$ is correct, because we're shifting the $M_B^D$ curve because of an increase in money demand ($Y$ has a positive influence on the $LM$-equation). Same applies to point $D$, except there we have a higher money supply, so we're moving to point $B$. Answer: Yes.

2) Are the opportunity costs of money saving higher in point $B$ or $D$?

There's a higher nominal interest rate in point $B$, so saving money in $B$ is more profitable than in $D$, thus the decision not to save money in $B$ is associated with higher opportunity costs. Answer: Point $B$.

3) Is the money demand in Point $B$ higher than in $C$, because of the transaction motive?

Both points lie on the curve $M_A^D$, and any point on that curve has the same amount of money demand, only the nominal interest rate and the money supply are different. Answer: Point $B$ and $C$ have the same money demand. Answer: no.

4) Can an increase of money supply be interpreted as a movement from point $A$ to $C$?

The movement from $A$ to $C$ implies a shift/increase of money demand not money supply. The correct movement is from $A$ to $D$. Answer: No, A to D is correct.

5) We're in Point $A$ and the households suddenly want to keep less money in their savings accounts. Can this be construed as a shift of the $M_B^D$ curve to the right?

Consumers now have a higher demand for liquid money, because they don't want to save it but spend it instead. The money demand curve must shift to the right. This leads us from point $A$ to $C$. Answer: Yes, the demand for liquid money is increased.

6) We're in point $D$ and the nominal interest rate starts to increase. What's the money market's reaction?

I'm not sure about this one... the nominal interest rate has a negative effect on the LM curve, thus a higher nominal interest rate will lead to decreased money demand (or a higher price level). But wouldn't that imply a demand curve shift to the left? From the diagram, it's an impossible reaction, as the increase of nominal interest rate is associated with a lower money supply or an increase in demand, no?

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All correct up to 6), although you may want to be careful with "$D$ to $A$ is correct" kind of answer, "$D$ to $A$ is consistent" seems a better phrasing - one has no idea how hard it comes out to quantify those shifts, because they impact each other.

Point 6) changes interest rate, which means that money supply, demand and interest rate do not coincide: the equilibrium is lost on the money market. As it is lost with higher interest rate than the equilibrium rate, it means that people want less money than is available. Like every good, this causes money to lose value, which in turns means either inflation on the open market, or a quick reaction via a decrease in supply from the central bank. As the question explicitly ask for the effect on the market, you can suppose the central bank doesn't make a move, and let the market move into inflation. This does happen in cases when the central bank doesn't want to or cannot cut money supply, usually because the central bank is controlled by the government, that needs the money, and led to some disastrous effects in the past. For this reason, usually central banks are relatively independent from governments, and hopefully the situation is addressed by central banks rather than by the market.

A case where the Government decided not to cut supply.

Here is an example of a government-dependent central bank having decided not to cut money. Wheelbarrows were commonly used on the way to buy loaves of bread in 1920s Germany...

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