talk of the structural  budget balance
                                  requires
                            talk of the structural trade balance 
example 
prime question:
if trade were balanced  at full employment
 what would be the remaining budget imbalance at full employment  ???
next ??
the imbalances between  (after tax and debt service) gross income 
of operating production firms and  firm gross  spending 
and then and only then 
imbalances in household (after tax and debt service ) income and  household spending 
note the interlacings here provided by  movements up and down to and from the  credit cloud are omitted
omitted 
but hardly irrelevent 
for a start 
cloud net domestic income must equal net domestic new lending 
growth ???
expanded reproduction ???
oh more complexity