  The diffusion of Electric Vehicles (EVs) plays a pivotal role in mitigating
greenhouse gas emissions, particularly in the U.S., where ambitious
zero-emission and carbon neutrality objectives have been set. In pursuit of
these goals, many states have implemented a range of incentive policies aimed
at stimulating EV adoption and charging infrastructure development, especially
public EV charging stations (EVCS). This study examines the indirect network
effect observed between EV adoption and EVCS deployment within urban
landscapes. We developed a two-sided log-log regression model with historical
data on EV purchases and EVCS development to quantify this effect. To test the
robustness, we then conducted a case study of the EV market in Los Angeles (LA)
County, which suggests that a 1% increase in EVCS correlates with a 0.35%
increase in EV sales. Additionally, we forecasted the future EV market dynamics
in LA County, revealing a notable disparity between current policies and the
targeted 80% EV market share for private cars by 2045. To bridge this gap, we
proposed a combined policy recommendation that enhances EV incentives by 60%
and EVCS rebates by 66%, facilitating the achievement of future EV market
objectives.
