However, Sismondi well knows that the means of production are not the sole requisites for production and exploitation; indeed, he has the proper instinct that the core of the relation of exploitation is the very fact of exchange with living labour. Having just reduced capital to constant capital, he now immediately reduces it exclusively to variable capital: 'When the farmer has put in reserve all the corn he expects to need till the next harvest, he will find a good use for the surplus corn: he will feed what he has left over to other people who are going to work for him, till his land, spin and weave his hemp and wool, etc.... By this procedure, the farmer converts a part of his income into capital, and in fact, this is the way in which new capital is always formed.... The corn he has reaped over and above what he must eat while he is working, and over and above what he will have to sow in order to maintain the same level of exploitation, is wealth which he can give away, squander and consume in idleness without becoming any poorer; it was income, but as soon as he uses it to feed producers, as soon as he exchanges it for labour, or for the fruits to come from the work of his labourers, his weavers, his miners, it is a permanent value that multiplies and will no longer perish; it is capital.'[165] Here there is some grain mixed up with quite a lot of chaff. Constant capital seems still required to maintain production on the old scale, although it is strangely reduced to circulating capital, and although the reproduction of fixed capital is completely ignored. Circulating capital apparently is also superfluous for the expansion of reproduction, for accumulation: the whole capitalised part of the surplus value is converted into wages for new workers who evidently labour in mid-air, without material means of production. The same view is expressed even more clearly elsewhere: 'When the rich man cuts down his income in order to add to his capital, he is thus conferring a benefit on the poor, because he himself shares out the annual product; and whatever he calls income, he will keep for his own consumption; whatever he calls capital, he gives to the poor man to constitute an income for him.'[166] Yet at the same time Sismondi gives due weight to the 'secret of profit-making' and the origin of capital. Surplus value arises from the exchange of capital for labour, from variable capital, and capital arises from the accumulation of surplus value. With all this, however, we have not made much progress towards a distinction between capital and income. Sismondi now attempts to represent the various elements of production and income in terms of the appropriate parts of the aggregate social product.