• Primary Program Transport and Urban Infrastructure
  • Research Interests -

Biography

Tamara is a visiting researcher at KAPSARC and an assistant professor of economics in the Darla Moore School of Business at the University of South Carolina. Her research interests include environmental and energy economics and how these fields interact with public policy. She holds a Ph.D. in Economics from the University of California, San Diego.

Publications

See all Tamara’s publications
  • Discussion papers
  • Instant Insights
  • Commentaries
  • KAPSARC journal articles
  • Think20 (T20)
Consumer Preferences for Ride-Hailing: The Barriers to an Autonomous, Shared, and Electric Future

Consumer Preferences for Ride-Hailing: The Barriers to an Autonomous, Shared, and Electric Future

Research has shown that when combined in a mobility-on-demand (MOD) framework, automation, carpooling, and electrification have the potential for theoretically large emission reductions. However, there is insufficient research regarding the consumer preferences for and behavioral responses to this vision of transportation in the future. In this paper, we use choice experiment data collected from an online ride-hailing survey to quantify the consumer preferences for these technologies.

28th March 2024
The Dynamic Role of Subsidies in Promoting Global Electric Vehicle Sales

The Dynamic Role of Subsidies in Promoting Global Electric Vehicle Sales

We offer the most comprehensive analysis to date of global plug-in electric vehicle (PEV) subsidies. We accomplish this by estimating vehicle choice models for 23 countries using 2010–2019 sales data and using counterfactual simulations to assess the cost-effectiveness of PEV incentives.

6th June 2023
How Cost-Effective Are Electric Vehicle Subsidies in Reducing Tailpipe-CO2 Emissions?

How Cost-Effective Are Electric Vehicle Subsidies in Reducing Tailpipe-CO2 Emissions?

The transportation sector accounts for 24% of global greenhouse gas (GHG) emissions (IEA 2020). Road transport is the most utilized mode because of its convenience (Van Essen 2008). However, it is also the most emissions intensive mode, accounting for 75% of global transport GHG emissions, with roughly 44% coming from road passenger vehicles alone (IEA 2020).    

8th June 2021
Are Electric Vehicle Subsidies Becoming More Impactful Over Time?

Are Electric Vehicle Subsidies Becoming More Impactful Over Time?

Various subsidies for plug-in electric vehicles (PEVs) have been implemented worldwide at the federal, state and regional levels. These subsidies aim to promote PEV adoption to help reduce both local air pollution and greenhouse gas emissions (Hardman 2019). In the United States (U.S.), the federal government began subsidizing PEVs in 2010.  

22nd March 2021
The Effectiveness of China’s Plug-In Electric Vehicle Subsidy

The Effectiveness of China’s Plug-In Electric Vehicle Subsidy

Subsidies for promoting plug-in electric vehicle (PEV) adoption are a key component of China’s overall plan for reducing local air pollution and greenhouse gas (GHG) emissions from its light-duty vehicle sector. This paper explores the impact and cost-effectiveness of the Chinese PEV subsidy program. A vehicle choice model is estimated using a large random sample of individual-level data for new vehicle purchases in China for model year 2017.

29th December 2019
Drivers of New Light-Duty Vehicle Fleet Fuel Economy in Saudi Arabia

Drivers of New Light-Duty Vehicle Fleet Fuel Economy in Saudi Arabia

This paper investigates the drivers of recent improvements in Saudi Arabia’s new light-duty vehicle fleet fuel economy. A vehicle choice model is estimated using aggregate and disaggregate new vehicle purchase data. The estimates are used to simulate counterfactual policy scenarios. The simulation results suggest that: Price elasticity of fuel economy for new vehicles has been decreasing in Saudi Arabia over recent years, but it is still more elastic than the new vehicle market in the United States (U.S.). Pegging Saudi Arabia’s fuel economy standards to U.S. fuel economy standards might warrant further economic evaluation. The increase in domestic gasoline prices in Saudi Arabia between 2014 and 2016 accounted for 42% of the increase in estimated new vehicle fleet fuel economy over that period. The remainder of the increase could be attributable to changes in product offerings and consumer preferences. The estimated elasticities, and thus policy sensitivities, vary by income and household size. Thus, a revenue-neutral ‘feebate’ policy – involving taxes on fuel-inefficient vehicles and rebates for fuel-efficient vehicles – could be more progressive than another gasoline price increase.

1st May 2019
The Impact of Recent Changes to China’s Plug-In Electric Vehicle Subsidy Design

The Impact of Recent Changes to China’s Plug-In Electric Vehicle Subsidy Design

Subsidies that promote plug-in electric vehicle (PEV) adoption have been a key component of China’s overall plan for reducing local air pollution and the greenhouse gas emissions from its light-duty vehicle sector. Since 2009, PEVs qualify for substantial rebates (up to US$9,000) from both the central and local Chinese governments. However, PEV subsidies were cut by almost 50% from June 2019 onward, and China had plans to eliminate the subsidies in 2020.

19th July 2020
Impact of India’s Recent Electric Vehicle Subsidy Announcement

Impact of India’s Recent Electric Vehicle Subsidy Announcement

The Indian government is urgently promoting electric vehicles (EVs) to help curb the country’s urban air pollution — the world’s worst, according to the World Health Organization. The steep increase in vehicle sales in recent years has brought deteriorating air quality and made India the third-highest oil consuming and greenhouse gas (GHG) emitting country in the world.

3rd December 2019
Impact of China’s Plug-In Electric Vehicle Subsidy Reduction

Impact of China’s Plug-In Electric Vehicle Subsidy Reduction

China, the world’s largest emitter of carbon dioxide, has set ambitious climate goals. These include reducing the carbon intensity of its 2005 gross domestic product (GDP) by 40-45% by 2020 and by 60-65% by 2030 (Xu, Chen, and Chen 2017). A key component of the country’s overall plan to reduce its carbon emissions is its New Energy Vehicle (NEV) policy. Battery electric vehicles (BEVs), which run solely on electricity, and plug-in hybrid electric vehicles (PHEVs), which run on electricity and gasoline or diesel, are a major component of China’s NEV policy and market. The policy is aimed at increasing the market shares of BEVs and PHEVs. It is as much a tool to help reduce carbon emissions and local air pollution as it is an industrial policy to help China leapfrog other countries in the plug-in electric vehicle (PEV, which includes both BEVs and PHEVs) manufacturing space. Japan, Germany and the United States (U.S.) continue to be leaders in internal combustion engine vehicle (ICEV) manufacturing, and China sees PEV manufacturing as a way to propel itself forward in the automotive manufacturing sector. PEV subsidies are one of the most commonly used policy levers for encouraging PEV purchases globally, including in China. They reduce the high up-front purchase price of PEVs relative to comparable ICEVs, one of the major barriers to PEV adoption. Since 2009, PEVs qualify for substantial rebates (up to US$9,000) from both the central and local Chinese governments (ICCT 2017a; Hancock 2019). Furthermore, in several big cities such as Shanghai and Shenzhen, PEVs are exempt from new vehicle registration fees (ICCT 2017b). These PEV support policies have led to significant PEV market share growth in recent years, with PEVs accounting for more than 4% of new vehicle sales in 2018 (IEA 2019). However, PEV subsidies are scheduled to be cut from June 26, 2019 (Kharpal 2019) by roughly 45% to 60% (Hancock 2019; Kharpal 2019).

17th July 2019
Responsiveness of Saudi New Vehicle Fleet Fuel Economy to Fuel and Vehicle Price Policy Levers

Responsiveness of Saudi New Vehicle Fleet Fuel Economy to Fuel and Vehicle Price Policy Levers

The Saudi government has implemented several policies to slow the growth of, or even reduce, its on-road motor gasoline consumption. These include demand-side policies such as raising fuel prices and supply-side policies such as the fuel economy standards (SASO and SEEC 2014). However, the extent to which these policies have been effective in improving the Saudi new vehicle fleet fuel economy is not well understood. This commentary highlights the findings from a recent KAPSARC paper published in the Energy Economics journal that explored the impact of fuel- and vehicle price-related policies on Saudi Arabia’s new vehicle fleet fuel economy (Sheldon and Dua 2020).

21st April 2021
Understanding the Evolution of the Impact and Cost-Effectiveness of Electric Vehicle Subsidies

Understanding the Evolution of the Impact and Cost-Effectiveness of Electric Vehicle Subsidies

Our previous research found that promoting plug-in electric vehicle (PEV) adoption through financial subsidies is expensive. In this commentary, we explore how the cost-effectiveness of the PEV subsidy program has evolved over time. To understand this evolution, we developed vehicle choice model-based counterfactual simulations using annual United States (U.S.) new vehicle market share and vehicle characteristics data for each of the model years (MYs) from 2011 to 2017.

30th August 2020

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