That percentage will be difficult to increase, explains Mr. Borman.
In Britain, retail outlets are demanding discounts from manufacturers, making it difficult to increase profit margins.
He complained that it will be difficult to increase "flag sensitivity".
Investment spending has a long planning cycle, and is difficult to increase quickly.
But companies have been finding it increasingly difficult to increase their oil production from older fields.
But they acknowledged that sanctuary cities are making it difficult to increase the number of annual deportations to past levels.
Wall Street tends to study cash flow closely, largely because it is extremely difficult to increase that number through accounting gimmicks often used to improve earnings.
'It will be difficult to increase consumption because young people aren't interested in eating whale meat,' said Nanami Kurasawa, director-general of the Dolphin and Whale Action network.
Government restrictions on advertising make it difficult to increase tobacco sales in Canada, pushing Rothmans to look south of the border.
Because most U.S. cities are developed around single-family homes designed for automobile owners, it's difficult to increase density and provide housing relief through new construction.
Moreover, it was difficult to increase the concentration of the nitride phase in the coatings by controlling spraying conditions such as N2 flow rate and RF power.
