The statement 'in countries with high malnutrition rates, both personal and national economies decline as productivity ceases' is true.
A country that is facing malnutrition will have a larger population of people facing poverty. As a result, the personal economy of the person will be declining due to malnutrition and no work.
When the personal economy is declining by a major amount, then this means that the national economy of the country is also declining. This is because a major part of the population is not doing any work as they are facing malnutrition.
The productivity of such countries will be ceased and in order to increase productivity, they will need to lower the rate of malnutrition.
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