Speaking after new analysis from NIESR and comments from CBI members and the Prudential, Mr Alexander said that the nationalists' plans would leave Scots facing big tax rises and spending cuts for many years to come.
'People across Scotland can now see clearly how deadly separation would be for jobs, growth and investment in Scotland.
'Today's powerful message from CBI members and the Prudential confirms that businesses from across Britain want to keep the UK together because it works. It is the foundation of the fastest economic recovery in the developed world. By smashing that foundation, nationalists would leave Scotland poorer and those businesses that stay in Scotland weaker.
'As the NIESR confirms today, that economic damage would leave Scots facing big tax rises and spending cuts for many years to come. The secret cuts to the NHS that Alex Salmond wanted to hide until after the referendum would be just the tip of the iceberg.
'A strong 'no' vote on Thursday will lift the uncertainty and put a spring in the step of the Scottish economy. Investment that has been paused can get going. A 'no' vote doesn't just mean a stronger Scottish Parliament, but a stronger Scottish economy too.'