For LMIEs, the EE fell from 104.1 to 72.8, while TFP increased from 0.909 to 1.018. The LMIE trajectory is characterized by a stronger reduction in EF and a relatively small rise in TFP, indicating This data indicates that across all income brackets, efficiency and productivity have increased consistently from 2000 to 2021. However, the extent of improvement varies by the income level. HIEs achieved the largest combined gains, followed by UMIEs and LMIEs. These results suggest a persistent gap in efficiency and productivity across income groups within the APO grouping. 6.3. Relationship between Energy Efficiency and Labor Productivity categorized by the income level, during 2000-21. Each point on the graph represents the average EE and LP values of a given income group in a specific year, with the dotted lines showing the overall trends within each group. A consistent negative correlation between EE and LP is observed, indicating that more efficient economies tend to exhibit higher LP. All income groups have shown improvements in both indicators over time, but the size of these improvements and the speed at which they have been achieved vary considerably between groups. For HIEs, average EE declined from 95.7 in 2000 to 65.1 in 2021, while LP increased from 0.777 to 1.206. This pattern demonstrates a clear shift toward greater energy efficiency accompanied by