Table 2 Final index categories (author’s work)

Regulatory quality^a

GII

“Doing Business 2018” – city ranking

Rule of Law^a

GII

“GII” – country-assigned specific scores

Education

GII

Literacy rate of the city

Research & Development (R&D)^a

GII

“GII” – country-assigned specific scores

EV charging ports

GII/MPI (tweaked)

Existing number of piles (both standard and quick-charging) measured per capita of the city

Savings from Gasoline over Electricity

GII/GCII (tweaked)

Measured as the monetary savings (£) obtained from travelling 100 km in an EV over a gasoline-powered vehicle – country ranking

Investment^a

GII/GCII

“Global Cities Investment Monitor 2018” – city ranking

Domestic Market Scale^a

GII

“GII” – country-assigned specific scores

Price

GCII (tweaked)

Price of most sold EV type in £ – by city

Green policies

GCII (tweaked)

Subsidies on EVs as % of vehicle price

Licenses

MPI (tweaked)

% of population who hold licenses – by city

Ease of license availability

MPI (tweaked)

Registered license plates per capita – by city

GDP growth rate

MPI

Yearly increase in GDP per capita of the city

Business risk^a

MPI

“Lloyd’s City Risk Index” – city ranking

Country risk^a

MPI

“Eulier Hermes Country Risk Ranking” – country ranking

Political risk^a

MPI/GII

“Political Risk Index” – country-assigned specific scores