Something Fishy

It is a staple at most Shabbos tables: fish. Gefilte fish is most popular, but other varieties persist as well. The prices of fish along with many other staples have risen modestly recently.
This shouldn’t crimp the Shabbos menu too much. Gefilte fish will still be the o-fish-al appetizer of Shabbos. However, what if we would, heaven forbid, experience a sharp increase in the price of fish? Would it still be the sole of the Shabbos table? Should people extend themselves to obtain their carp, being at the mercy of fishmongers – hook, line, and sinker? Should they seek out a loan shark to borrow money? Also, what is the Talmud’s view on price regulation? Do we believe in laissez-faire, or is some oversight needed? Were the Sages concerned at all with food prices? Mullet over for a second, then read the rest.
The Gemara in Taanis (15) rules that we do not start a series of fasts due to lack of rain on a Thursday. When people start buying food for Shabbos on Thursday and for the after fast dinner, this may cause a dramatic rise in prices. Merchants may wonder at the sudden and unexpected heavy demand on Thursday and assume there is a shortage coming. They will, in turn, raise prices. To prevent this, the series of necessary fasts for rain start on a Monday.