Selective rendering for efficient ray traced stereoscopic images

Depth-related visual effects are a key feature of many virtual environments. In stereo-based systems, the depth effect can be produced by delivering frames of disparate image pairs, while in monocular environments, the viewer has to extract this depth information from a single image by examining details such as perspective and shadows. This paper investigates via a number of psychophysical experiments, whether we can reduce computational effort and still achieve perceptually high-quality rendering for stereo imagery. We examined selectively rendering the image pairs by exploiting the fusing capability and depth perception underlying human stereo vision. In ray-tracing-based global illumination systems, a higher image resolution introduces more computation to the rendering process since many more rays need to be traced. We first investigated whether we could utilise the human binocular fusing ability and significantly reduce the resolution of one of the image pairs and yet retain a high perceptual quality under stereo viewing condition. Secondly, we evaluated subjects' performance on a specific visual task that required accurate depth perception. We found that subjects required far fewer rendered depth cues in the stereo viewing environment to perform the task well. Avoiding rendering these detailed cues saved significant computational time. In fact it was possible to achieve a better task performance in the stereo viewing condition at a combined rendering time for the image pairs less than that required for the single monocular image. The outcome of this study suggests that we can produce more efficient stereo images for depth-related visual tasks by selective rendering and exploiting inherent features of human stereo vision

Optimal Patent Policy and Wealth Inequality in a Schumpeterian Economy

Does wealth inequality affect optimal patent policy? This study develops a Schumpeterian growth model with heterogeneous households to explore this question. Our model features a general innovation specification that nests two common specifications: (a) the knowledge-driven specification that uses R&D labor, and (b) the lab-equipment specification that uses final output for R&D. Under the knowledge-driven specification, all households prefer the same level of patent protection. However, under the lab-equipment specification, less wealthy households prefer weaker patent protection, so wealth inequality reduces optimal patent protection and economic growth. Under the general innovation specification, strengthening patent protection has an inverted-U effect on innovation, in contrast to the positive effect under the two special cases. More importantly, wealth inequality also reduces optimal patent protection. Therefore, the wealth distribution generally affects optimal patent policy. Calibrating the model to US data, we find that eliminating wealth inequality raises economic growth significantly via stronger patent protection

Optimal Patent Policy and Wealth Inequality in a Schumpeterian Economy

Does wealth inequality affect optimal patent policy? This study develops a Schumpeterian growth model with heterogeneous households to explore this question. The model features a general innovation specification that captures two common specifications as special cases: (a) the knowledge-driven specification that uses R&D labor, and (b) the lab-equipment specification that uses final output for R&D. Under the knowledge-driven specification, all households prefer the same level of patent protection. However, under the lab-equipment specification, wealthier households prefer stronger patent protection, and higher wealth inequality reduces the optimal level of patent protection and economic growth. Under the general innovation specification, strengthening patent protection has an inverted-U effect on innovation, in contrast to the positive effect under the two special cases. Furthermore, wealthier households continue to prefer stronger patent protection, and wealth inequality also reduces optimal patent protection. Therefore, all households preferring the same level of patent protection under the knowledge-driven specification is due to a knife-edge parameter condition. Calibrating the model to US data, we find that eliminating wealth inequality raises the optimal level of patent protection and economic growth

Inflation, R&D and growth in an open economy

This study explores the long-run effects of inflation in a two-country Schumpeterian growth model with cash-in-advance constraints on consumption and R&D investment. We find that increasing domestic inflation reduces domestic R&D investment and the growth rate of domestic technology. Given that economic growth in a country depends on both domestic and foreign technologies, increasing foreign inflation also affects the domestic economy. When each government conducts its monetary policy unilaterally to maximize the welfare of domestic households, the Nash-equilibrium inflation rates are generally higher than the optimal inflation rates chosen by cooperative governments who maximize the welfare of both domestic and foreign households. Under the CIA constraint on R&D (consumption), a larger market power of firms amplifies (mitigates) this inflationary bias. We use cross-country panel data to estimate the effects of inflation on R&D and also calibrate the two-country model to data in the Euro Area and the US to quantify the welfare effects of decreasing the inflation rates from the Nash equilibrium to the optimal level

How Minimum Wages affect Automation and Innovation in a Schumpeterian Economy

This study explores the effects of minimum wage on automation and innovation in a Schumpeterian growth model. We find that raising the minimum wage decreases the employment of low-skill workers and has ambiguous effects on innovation and automation. Specifically, if the elasticity of substitution between low-skill workers and high-skill workers in production is less (greater) than unity, then raising the minimum wage leads to an increase (a decrease) in automation and innovation. We also provide a quantitative analysis by simulating the effects of minimum wage on the macroeconomy. Finally, we test our theoretical results by estimating the elasticity of substitution between low-skill workers and high-skill workers and the effects of minimum wage on automation and innovation in China

How Minimum Wages affect Automation and Innovation in a Schumpeterian Economy

This study explores the effects of minimum wage on automation and innovation in a Schumpeterian growth model. We find that raising the minimum wage decreases the employment of low-skill workers and has ambiguous effects on innovation and automation. Specifically, if the elasticity of substitution between low-skill workers and high-skill workers in production is less (greater) than unity, then raising the minimum wage leads to an increase (a decrease) in automation and innovation. We also provide a quantitative analysis by simulating the effects of minimum wage on the macroeconomy. Finally, we test our theoretical results by estimating the elasticity of substitution between low-skill workers and high-skill workers and the effects of minimum wage on automation and innovation in China

A Tale of Two Growth Engines: Interactive Effects of Monetary Policy and Intellectual Property Rights

How do intellectual property rights that determine the market power of firms influence the growth and welfare effects of monetary policy? To analyze this question, we develop a monetary hybrid endogenous growth model in which R&D and capital accumulation are both engines of long‐run economic growth. We find that monetary expansion hurts economic growth and social welfare by reducing R&D and capital accumulation. Furthermore, a larger market power of firms strengthens these growth and welfare effects of monetary policy through the R&D channel but weakens these effects through the capital‐accumulation channel. Therefore, whether the market power of firms amplifies or mitigates the welfare cost of inflation depends on the relative importance of the two growth engines. Finally, we calibrate the model using data in the United States and the Euro Area to quantitatively evaluate and compare the welfare cost of inflation in these two economies and find that the R&D channel dominates in both economies

A Note on Environment-dependent Time Preferences

In this paper we investigate the growth effect of environmental taxes when the time preference is endogenously determined by the environmental quality. We find that if people become more patient due to a cleaner environment, raising the environmental tax may reduce pollution and stimulate growth. Moreover, the Pigouvian principle may be inefficient in the presence of an endogenous time preference

A Note on Environment-dependent Time Preferences

In this paper we investigate the growth effect of environmental taxes when the time preference is endogenously determined by the environmental quality. We find that if people become more patient due to a cleaner environment, raising the environmental tax may reduce pollution and stimulate growth. Moreover, the Pigouvian principle may be inefficient in the presence of an endogenous time preference

A tale of two growth engines: The interactive effects of monetary policy and intellectual property rights

How do intellectual property rights that determine the market power of firms influence the effects of monetary policy on economic growth and social welfare? To analyze this question, we develop a monetary R&D-based growth model with elastic labor supply. We find that monetary expansion reduces growth and welfare through a decrease in labor supply that reduces R&D. Furthermore, a larger market power of firms strengthens these effects of monetary policy in the R&D model. In contrast, increasing the market power of firms dampens the growth and welfare effects of monetary policy in the AK model. Therefore, the market power of firms has drastically different implications on the welfare cost of inflation under the two growth engines (i.e., innovation versus capital accumulation). We also calibrate the two models using data in the US and the Euro Area to quantitatively evaluate and compare the welfare cost of inflation in the two economies. Finally, we simulate transition dynamics of the R&D model in order to compute the complete welfare changes from reducing inflation