The economy of the city of Zagreb represents the bulk of the economy of Croatia proper. Its most significant components are wholesale and retail trade, accounting for 38.1% of the city's economic income, followed by the processing industry, encompassing 20.3% of the economy of Zagreb. Further industries, by income share, are the energy industry—the supply of electric power, natural gas, steam, and air conditioning (7.8%); information and communications (7.2%); civil engineering (5.4%), professional technical and scientific services (4.6%); financial services (4.5%); and transport and storage services (3.9%). These account for 91.8% of the total income of the city's economy. Small businesses generate 22% of the total income; 14.4% is attributed to medium enterprises and the rest to large companies. The economy of the Zagreb County, largely contiguous with Zagreb's metropolitan area, is dominated by wholesale and retail trade (53.5% of total income) and the processing industry (25.7%), followed by transport (6.1%) and civil engineering (5.3%). Unlike the economy of the city of Zagreb, the county's economic income is largely generated by small and medium businesses (64.6%). The city of Zagreb and the Zagreb County dominate the economy of the Croatia proper and Croatia as a whole: nearly 91% of all Croatia's wholesale and retail trade companies and 45% of the Croatian processing industry is headquartered there.