Our own nation is now rife with corruption and the result is that our people are being divided into a small number of extremely wealthy 'elites', and a huge number of poor and people just scraping by , with fewer and fewer living in between. So, yes. it appears that the result of corruption is to create this huge divide between rich and poor, with a very small number of people on the 'rich' side, and a very large number of poor.
The solution for this in the U.S. has traditionally been representational democracy, in which the influence of the rich on government policy is offset by the will of everyone else, as expressed through elections. If a politician served the rich too exclusively, he could be elected out of office and replaced by one that serves the broader constituency. But those days are long gone in the U.S., as the rich now control virtually every candidate, of either electable party, and so will be served almost exclusively regardless of who gets elected. And they do this through the legalized bribery of campaign financing, through lobbying, and through the promise of after-office patronage jobs.
The result of which is that a recent study found that there is literally no mathematical correlation between the behavior of the U.S. legislature and the will of the people of the United States. The politicians are not responding to the people's wishes regarding any issue, for or against, AT ALL!
So I don't really see how we have any way of telling any other nation how to combat internal corruption. As we clearly have no idea how to combat it here in our own country.