Basic earnings per share is computed by dividing net income attributable to Republic Services, Inc. by the weighted average number of common shares (including vested but unissued RSUs and PSUs) outstanding during the period. Diluted earnings per share is based on the combined weighted average number of common shares and common share equivalents outstanding, which include, where appropriate, the assumed exercise of employee stock options, unvested RSUs and unvested PSUs at the expected attainment levels. We use the treasury stock method in computing diluted earnings per share.

Earnings per share for the years ended December 31, 2023, 2022 and 2021 are calculated as follows (in thousands, except per share amounts):


	2023		2022		2021
Basic earnings per share:
Net income attributable to Republic Services, Inc.	$	1,730,985	$	1,487,586	$	1,290,405
Weighted average common shares outstanding	316,182		316,530		318,811
Basic earnings per share	$	5.47	$	4.70	$	4.05
Diluted earnings per share:
Net income attributable to Republic Services, Inc.	$	1,730,985	$	1,487,586	$	1,290,405
Weighted average common shares outstanding	316,182		316,530		318,811
Effect of dilutive securities:

Unvested RSU awards	104		152		266
Unvested PSU awards	379		398		348
Weighted average common and common equivalent shares outstanding	316,665		317,080		319,425
Diluted earnings per share	$	5.47	$	4.69	$	4.04