The coordinate axes of political charts and mathematics are a little different.
In mathematics,
the coordinate axis is generally the x-axis and the horizontal axis variable is the independent variable
quantity;
However, in political chart questions, the vertical axis variable is generally used as the independent variable, that is, x, and the horizontal axis variable is as y, which is the dependent variable.
So when looking at the graph and analyzing the graph, you should pay attention to distinguishing the independent variables and the dependent variables.
In addition, there is another important aspect.
It is necessary to distinguish the images before and after the change.
If there are no special provisions for general questions,
The solid line is before the change, that is, the original one.
The dotted line is after the change.
Sometimes there are regulations, so be sure to read them clearly.
Finally, and the most important thing is to specifically analyze
the changes and relative relationships between supply, demand, and price based on the meaning of the question.
A brief analysis of this question,
Technological progress has led to the emergence of substitute B, and B is more cost-effective
then, it is obvious that B’s demand will rise (assuming that everyone
is a rational consumer, this is a commonly used assumption, and universities will talk about it)
So, the demand for A as a substitute will fall, and the demand function The image
pans to the left, causing merchants to cut prices to stimulate demand growth.
So the answer to this question is A
What should be noted here is option C,
When demand drops, generally producers will reduce production to stabilize prices
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grid. The supply curve cannot shift to the right.