The limitations of macro and micro economics are not as easy to spot as many people think they are. This is because the theory behind these two models is similar, yet very different. And when the theory behind both is similar, there can be very few limitations to what you can do with it. It is a very similar theory to Keynesian economics, in that they both deal with money and how economic activity can take place within that money, but it is a very different one.
Many people say that economics is just a series of rules for how economies operate within a given economic model. This is true, but it also comes with its own set of limitations. Many things that are part of the theoretical foundation of economics are actually possible by using this simple model. And it is a good thing that we don't need a complicated set of rules in order to understand the way how things work. It allows us to keep our head in the general framework of things and make more informed decisions.
The problem is that there are some things that macroeconomic theory can't actually control. One example of this is how things happen when interest rates go up or down. When rates go up or down, it affects how much money that is available to the economy. And that means that there can be more money put back into the economy through spending than there was before. However, the theory behind these theories may say that it is okay for that kind of thing to occur. They don't tell us that it is the only kind of thing that should happen, or that it is something that should be prevented.
Another limit of the macroeconomic model is that there aren't any kind of boundaries. There can never be a time where there isn't enough money in the economy. And if you look at all the different economies over the years, there are times when there are more than enough dollars to pay for the economy's basic needs. The limitations are not really in the amount of money that is available, but in how it is used.
Some have said that these are just some limitations of micro and macro economics. This is simply not true. If you take a look at it on a deeper level, you will see that these two theories really aren't limited by anything except the number of assumptions that they make. That is why they are both possible, and that is why they are also possible to use in practice.
When you consider what is actually going on in the real world and look at things like unemployment and inflation, the limits of microeconomic theory are not that big of a deal. And they are very similar to those of macroeconomic theory.