Guardian News & Media (GNM) increased the The Guardian's cover price by 20p to £1.20 from 19 September.
It also raised the cover price of the Saturday issue of The Guardian by 20p to £2.10.
Unofficial industry figures are reported to show that on average, in the six weeks before the price rise, the weekday issue of The Guardian had an average circulation of 205,000. In the four weeks since then, its average weekday circulation dropped to 196,000, a fall of 4.4 per cent.
But sources believe executives at The Guardian will not be too disappointed, as it is now taking an average of £235,000 a day on cover price, compared to £196,000 before the increase.