A hypothesis in an economic model is a statement that may be either correct or incorrect about an economic variable. a. Tested b
efore it can be accepted (or not rejected).b. A statement that ma either current or incorrect about an economic variable.c. Usually about a causal relationship.d. All of the above—An economic variable is something measurable that can have different values. An economic hypothesis is usually about a causal relationship. Before accepting a hypothesis, we must test it.
The correct answer is option d. "All of the above".
Explanation:
A hypothesis is a proposed explanation, based on the evidence that is at hand, for a set of observations and looking for further investigations. A hypothesis in an economic model works under the same premise that a hypothesis in a scientific investigation. The hypothesis may be correct or incorrect, therefore it should be tested before it can accepted only if the results show that the hypothesis explains all the obtained explanations. Regarding economic model hypothesis, usually they deal with causal relationships between an observed phenomena and the origin of it.
The direct source of energy to move the sailboat is probably wind, since wind is what pushes the sail of the sailboat, which is what propels the sailboat forward.
The primary function of a leaf is photosynthesis and the chloroplast is the main site for photosynthesis. The rate of photosynthesis is much more in leaves as compared to that of roots. Chloroplast is the place where light and dark reactions takes place. Chloroplast contains a pigment called chlorophyll that absorbs light from the sun for the process of photosynthesis.
