As kids, we have all heard this quote, ‘one bad fish can spoil the whole pond’. Similarly, on the D-Street, one big fall on Thursday led to a negative close for Nifty on a weekly basis. For the week gone by, Nifty lost 1.27 per cent, while Nifty Mid-cap and Small-cap lost 1.79 per cent and 0.63 per cent, respectively.