I am curious about applying my coursework from Masters program towards Doctoral in Economics in the US
There is no uniform policy in the US. You must check with each program you are interested in.

Graduate departments are generally give broad latitude in accepting coursework from other schools. Some may choose to give either credit or merely placement; some may offer both or neither. Some may require what they consider “core” courses to be retaken but allow electives to count. Other schools may have a limit on the number of transfer credits they will accept. There are simply too many variations, so direct questions to the graduate admissions officer or director of graduate studies (or the equivalent( is your best option.

As @Dawn has suggested in the comments below, it is indeed worth noting that one should likely not ignore the possibility of taking the core classes required to pass the department's qualification examinations, and most advisors will encourage you to do exactly that.