The Executive, as its name suggests, should be working for the execution and in the Polity, I think, it would be executing the laws. The laws are made (or consented, if you like) by the legislative (Congress or Parliament).
On 8th November 2016, the Prime Minister of India: Mr. Narendra Modi declared that the paper currency of Rupees 1000 and 500 would be not be a legal tender anymore.
Declaring some currencies as no longer legal currencies is, I'm positive, a kind of law (by the Bentham's definiton "every law is an infringement of right"). But why an executive made a law? His job was to implement a law which had been agreed (sometimes acquiesced) by the legislators. After that declaration, I found the Indian Parliament didn't discuss if the law (banning of currency) is to be made or should be taken back (because legislators do not agree with it) by the executive rather the Parliament asked the executive about the effects of that declaration in the Question Hour.
Can executives make laws? If yes, then it means the Executive have a fusion of legislative and implementative powers in it, but that suggest that legislative is a bit redundant then.