a. The US dollars are generally the international currency of the upstream petroleum industry and it consist of three "blood types" for applications in valuation modeling. Present simple scenario to distinguish between the "real dollars", inflated dollars and discounted dollars as applied to upstream petroleum valuation modeling. (5 marks) a. The US dollars are generally the international currency of the upstream petroleum industry and it consist of three "blood types" for applications in valuation modeling. Present simple scenario to distinguish between the "real dollars", inflated dollars and discounted dollars as applied to upstream petroleum valuation modeling