Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.


table of contents the following table discloses purchases of shares of our common stock made by us or on our behalf during the fourth quarter of 2017 . period total number of shares purchased average price paid per share total number of shares not purchased as part of publicly announced plans or programs ( a ) total number of shares purchased as part of publicly announced plans or programs approximate dollar value of shares that may yet be purchased under the plans or programs ( b ) . <table class='wikitable'><tr><td>1</td><td>period</td><td>total numberof sharespurchased</td><td>averageprice paidper share</td><td>total number ofshares notpurchased as part ofpublicly announcedplans or programs ( a )</td><td>total number ofshares purchased aspart of publiclyannounced plans orprograms</td><td>approximate dollarvalue of shares thatmay yet be purchasedunder the plans orprograms ( b )</td></tr><tr><td>2</td><td>october 2017</td><td>515762</td><td>$ 77.15</td><td>292145</td><td>223617</td><td>$ 1.6 billion</td></tr><tr><td>3</td><td>november 2017</td><td>2186889</td><td>$ 81.21</td><td>216415</td><td>1970474</td><td>$ 1.4 billion</td></tr><tr><td>4</td><td>december 2017</td><td>2330263</td><td>$ 87.76</td><td>798</td><td>2329465</td><td>$ 1.2 billion</td></tr><tr><td>5</td><td>total</td><td>5032914</td><td>$ 83.83</td><td>509358</td><td>4523556</td><td>$ 1.2 billion</td></tr></table> ( a ) the shares reported in this column represent purchases settled in the fourth quarter of 2017 relating to ( i ) our purchases of shares in open-market transactions to meet our obligations under stock-based compensation plans , and ( ii ) our purchases of shares from our employees and non-employee directors in connection with the exercise of stock options , the vesting of restricted stock , and other stock compensation transactions in accordance with the terms of our stock-based compensation plans . ( b ) on september 21 , 2016 , we announced that our board of directors authorized our purchase of up to $ 2.5 billion of our outstanding common stock ( the 2016 program ) with no expiration date . as of december 31 , 2017 , we had $ 1.2 billion remaining available for purchase under the 2016 program . on january 23 , 2018 , we announced that our board of directors authorized our purchase of up to an additional $ 2.5 billion of our outstanding common stock with no expiration date. .
Question: what was the share price in november 2017?
Answer: 81.21
Question: what was it in october 2017?

77.15