This is what is tripping you up:
Godley & Lavoie p. 24
"In the initial standard
national accounting – as was shown in its most elementary form with the
help of Table 1.1 – little room was left for banks and financial intermedi-
aries and the accounts were closed on the basis of the famous Keynesian
equality, that saving must equal investment. This initial system of accounts
is a system that presents ‘the sector surpluses that ultimately finance real
investment’, but it does not present ‘any information about the flows in
financial assets and liabilities by which the saving moves through the finan-
cial system into investment. These flows in effect have been consolidated out’
(Dawson 1991 (1996: 315)). In standard national accounting, as represented
by the National Income and Product Accounts (NIPA), there is no room to
discuss the questions that Copeland was keen to tackle, such as the changes
in financial stocks of assets and of debts, and their relation with the transac-
tions occurring in the current or the capital accounts of the various agents
of the economy. In addition, in the standard macroeconomics textbook,
households and firms are often amalgamated within a single private sec-
tor, and hence, since financial assets or debts are netted out, it is rather
difficult to introduce discussions about such financial issues, except for
public debt. "