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Problem 1: US Real GDP The reference mode of the US GDP is shown in Figure 1 US Real GDP 8000 AveragrowtRat.45%/year DoublingTime 20years 4000 0 1850 1900 1950 2000 Figure 1: US GDP (Sterman, 2001) 1. Identify the positive loops responsible for the growth of the US GDP 2. Sketch a causal loop diagram to capture the loops you identify 3. Identify potential negative feedbacks that might halt growth in the system