Answer:
A country that imports more goods and services than it exports in terms of value has a trade deficit or a negative trade balance. Conversely, a country that exports more goods and services than it imports has a trade surplus or a positive trade balance.
A longitudinal study is defined as a design that deals with repeated observation and consist of same variables over a period of time.
Explanation:
There are various limitations of longitudinal research but the most important limitation is that is there is huge possibility of unpredictable outcomes. Longitudinal study is based on various cases that is it observes individual for a long period of time and thus it is qualitative in nature.
In case of longitudinal research its very time consuming that is it require much amount of time and the data that is collected is not at all 100% reliable. It is expensive in nature and large sample size is required.
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A. Just took it it was correct