The return should reflect such risk factors as the project's technical complexity, the agency's management capacity, the likelihood of cost overruns, and the consequences of under- or non-performance.
Investors have been put off by this, and by the complexity of the new venture's management (Mr Inoue already admits to a tiff about whether or not to use advertising hoardings).
"Regulators have reduced the complexity of products, but they have increased regulatory complexity so it's more complex for bank management, " he said.