Half the Australian businesses that got a tax cut have banked the cash Half the Australian businesse, page-65

WRONG.

A business is just legal title for the business activity.
A company IS a legal entity like a person.

Companies can retain some profits, but a glance at most public companies is that most profit is dispersed as dividends.
The dividends are taxable by the shareholder.
Sorry to be pedantic BUT - If you don't get the basics right, there is no understanding of business, corporate structures, owners, employers, shareholders and finally the difference between revenue and profit.