It is to be hoped that in part II, the writer will succinctly advance a crisis-theory and judgmentally compare/contrast it with one or more of the others that are on tap, among which figure:
1) Tendency for the Rate of Profit to Fall. (Especially as advanced by Mattick Jnr)
2) Disproportionality:
a) specifically, ‘imbalance between production of means of production and production of consumer goods and services’
b) generally, ‘disproportionate growth between different sectors of the economy’, not necessarily Depts 1 and 2. (SPGB general but not official view?)
3) Class-struggle (–> profit-squeeze)
4) Underconsumption and or eclectic/mixed. (Harvey? Heinrich??)