Fig 2 is incorrect. The authors have provided a corrected version here. Fig 2. Simulation results. Results obtained for the indicators selected under a fractional-reserve system-without government intervention (red dotted line) and with government intervention when the total natural resource stock is at 25% (yellow short-dash) and 50% (green solid line)-and under a full-reserve system (purple long-dash line). Black coloured curves (i.e. dotted, solid, short and long-dashed) show the mean

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... whereas coloured bands represent the standard error bars including all the runs computed for each indicator under every scenario.