“…3 One justification for a high level of aggregation rests on the heroic assumption that perspicacious households, as shareholders, 'pierce the corporate veil', adjusting their decisions to offset the saving done on their behalf by corporations. Perhaps surprisingly, this proposition enjoys some empirical support; 4 the most striking finding, not confined to the UK, is that 'corporate retentions have a well-determined impact on measured consumers' expenditure' (Sumner, 2008). The pierced corporate veil rationale for across-sector aggregation has a limited following, however.…”