An additional dollar of government saving and debt reduction does not automatically increase national saving and investment by a dollar because changes in saving by households and businesses will tend to offset some of the change in government saving.
A reduction of just $1 in government saving and debt expenditures will increase national saving and investment also by $1. 
mnli hypothesis: A reduction of just $1 in government saving and debt expenditures will increase national saving and investment also by $1.  premise: An additional dollar of government saving and debt reduction does not automatically increase national saving and investment by a dollar because changes in saving by households and businesses will tend to offset some of the change in government saving.