A deeply corrupted world. This is the impression you get reading the Corruption Perception Index 2016, a survey carried out by Transparency International which analyses the levels of corruption country by country.

Over two-thirds of the 176 countries and territories in this year's index fall below the midpoint of our scale of 0 (highly corrupt) to 100 (very clean). The global average score is a paltry 43, indicating endemic corruption in a country's public sector. Top-scoring countries (yellow in the map below) are far outnumbered by orange and red countries where citizens face the tangible impact of corruption on a daily basis.

This year’s results highlight the connection between corruption and inequality, which feed off each other to create a vicious circle between corruption, unequal distribution of power in society, and unequal distribution of wealth.

The interplay of corruption and inequality also feeds populism. When traditional politicians fail to tackle corruption, people grow cynical. Increasingly, people are turning to populist leaders who promise to break the cycle of corruption and privilege. Yet this is likely to exacerbate – rather than resolve – the tensions that fed the populist surge in the first place. (Read moreabout the linkages between corruption, inequality and populism.)

The lower-ranked countries in our index are plagued by untrustworthy and badly functioning public institutions like the police and judiciary. Even where anti-corruption laws are on the books, in practice they're often skirted or ignored. People frequently face situations of bribery and extortion, rely on basic services that have been undermined by the misappropriation of funds, and confront official indifference when seeking redress from authorities that are on the take.

Higher-ranked countries tend to have higher degrees of press freedom, access to information about public expenditure, stronger standards of integrity for public officials, and independent judicial systems. But high-scoring countries can't afford to be complacent, either. While the most obvious forms of corruption may not scare citizens' daily lives in all these places, the higher-ranked countries are not immune to closed-door deals, conflicts of interest, illicit finance, and patchy law enforcement that can distort public policy and exacerbate corruption at home and abroad.