This is a tough question. Many believe they know some economic data releases are very significant and so a true market movers, and some are trivial. From Yahoo's financial website, it lists at least 65 active economic data releases in the economic data calendar, including such as FOMC Rate Decision. I did some analysis and list all those 65 economic data in the order of significance (I used the magnitude of volume changes over the broader market index as the indicator to measure the efficiency of the data, and the analysis is based on all data since 2001). From the most to the least significant, here is:
1 FOMC Rate Decision
2 GDP-Adv.
3 Chain Deflator-Adv.
4 Current Account
5 CPI
6 Core CPI
7 Productivity-Prel
8 Feds Beige Book
9 Housing Starts
10 Building Permits
11 Help-Wanted Index
12 Employment Cost Index
13 Chicago PMI
14 Crude Inventories
15 Initial Claims
16 PPI
17 Core PPI
18 Truck Sales
19 Auto Sales
20 FOMC Minutes
21 FHFA Housing Price Index
22 Retail Sales ex-auto
23 Retail Sales
24 Consumer Confidence
25 Industrial Production
26 Capacity Utilization
27 Empire Manufacturing
28 MBA Mortgage Index
29 Trade Balance
30 Treasury Budget
31 Philadelphia Fed
32 GDP-Prel.
33 ADP Employment
34 Continuing Claims
35 ISM Services
36 Construction Spending
37 Durable Orders
38 Business Inventories
39 Existing Home Sales
40 Net Long-Term TIC Flows
41 NAHB Housing Market Index
42 Leading Indicators
43 Factory Orders
44 Case-Shiller 20-city Index
45 Natural Gas Inventories
46 Durable Orders -ex Transportation
47 Unemployment Rate
48 Nonfarm Payrolls
49 Hourly Earnings
50 Average Workweek
51 Productivity-Rev.
52 Import Prices ex-oil
53 Export Prices ex-ag.
54 ISM Index
55 Wholesale Inventories
56 New Home Sales
57 Personal Spending
58 Personal Income
59 Michigan Sentiment - Final
60 Challenger Job Cuts
61 Pending Home Sales
62 PCE Prices
63 Consumer Credit
64 Mich Sentiment-Prel.
65 Mich Sentiment-Rev.
1 FOMC Rate Decision
2 GDP-Adv.
3 Chain Deflator-Adv.
4 Current Account
5 CPI
6 Core CPI
7 Productivity-Prel
8 Feds Beige Book
9 Housing Starts
10 Building Permits
11 Help-Wanted Index
12 Employment Cost Index
13 Chicago PMI
14 Crude Inventories
15 Initial Claims
16 PPI
17 Core PPI
18 Truck Sales
19 Auto Sales
20 FOMC Minutes
21 FHFA Housing Price Index
22 Retail Sales ex-auto
23 Retail Sales
24 Consumer Confidence
25 Industrial Production
26 Capacity Utilization
27 Empire Manufacturing
28 MBA Mortgage Index
29 Trade Balance
30 Treasury Budget
31 Philadelphia Fed
32 GDP-Prel.
33 ADP Employment
34 Continuing Claims
35 ISM Services
36 Construction Spending
37 Durable Orders
38 Business Inventories
39 Existing Home Sales
40 Net Long-Term TIC Flows
41 NAHB Housing Market Index
42 Leading Indicators
43 Factory Orders
44 Case-Shiller 20-city Index
45 Natural Gas Inventories
46 Durable Orders -ex Transportation
47 Unemployment Rate
48 Nonfarm Payrolls
49 Hourly Earnings
50 Average Workweek
51 Productivity-Rev.
52 Import Prices ex-oil
53 Export Prices ex-ag.
54 ISM Index
55 Wholesale Inventories
56 New Home Sales
57 Personal Spending
58 Personal Income
59 Michigan Sentiment - Final
60 Challenger Job Cuts
61 Pending Home Sales
62 PCE Prices
63 Consumer Credit
64 Mich Sentiment-Prel.
65 Mich Sentiment-Rev.