填空题 　　If a farmer wishes to succeed, he must try to keep a wide gap between his consumption and his production. He must store a large quantity of grain 　 ---|||________|||---　 consuming all his grain immediately. He can continue to support himself and his family 　 ---|||________|||---　 he produces a surplus. He must use this surplus in three ways: as seed sowing, as an insurance 　 ---|||________|||---　 the unpredictable effects of bad weather and as a commodity which he must sell in order to 　 ---|||________|||---　 old agricultural implements and obtain chemical fertilizers to 　 ---|||________|||---　 the soil. He may also need money to construct irrigation 　 ---|||________|||---　 and improve his farm in other ways. If no surplus is available, a farmer cannot be 　 ---|||________|||---　 . He must either sell some of his property or 　 ---|||________|||---　 extra funds in the m of loans. Naturally he will try to borrow money at a low 　 ---|||________|||---　 of interest, but loans of this kind are not 　 ---|||________|||---　 obtainable.