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recently i learned the reason from the book OpenCV 3 Blueprints

lets look parameters of detectMultiScale

CV_WRAP void detectMultiScale( InputArray image,
                      CV_OUT std::vector<Rect>& objects,
                      double scaleFactor = 1.1,
                      int minNeighbors = 3, int flags = 0,
                      Size minSize = Size(),
                      Size maxSize = Size() );

minNeighbors Parameter specifying how many neighbors each candidate rectangle should have to retain it.

if you set minNeighbors prameter to zero you will get all the candidates

so you should to change your code like

euro2_cascade.detectMultiScale( src_gray, money, 1.1, 3, 0, cv::Size(10, 10),cv::Size(2000, 2000) );

also i think minSize parameter value is too small

recently i learned the reason from the book OpenCV 3 Blueprints

lets look parameters of detectMultiScale

CV_WRAP void detectMultiScale( InputArray image,
                      CV_OUT std::vector<Rect>& objects,
                      double scaleFactor = 1.1,
                      int minNeighbors = 3, int flags = 0,
                      Size minSize = Size(),
                      Size maxSize = Size() );

minNeighbors Parameter specifying how many neighbors each candidate rectangle should have to retain it.

if you set minNeighbors minNeighbors prameter to zero you will get all the candidates

so you should to change your code like

 euro2_cascade.detectMultiScale( src_gray, money, 1.1, 3, 0, cv::Size(10, 10),cv::Size(2000, 2000) );
);

recently i learned the reason from the book OpenCV 3 Blueprints

lets look parameters of detectMultiScale

CV_WRAP void detectMultiScale( InputArray image,
                      CV_OUT std::vector<Rect>& objects,
                      double scaleFactor = 1.1,
                      int minNeighbors = 3, int flags = 0,
                      Size minSize = Size(),
                      Size maxSize = Size() );

minNeighbors Parameter specifying how many neighbors each candidate rectangle should have to retain it.

if you set minNeighbors prameter parameter to zero you will get all the candidates

so you should to change your code like

  euro2_cascade.detectMultiScale( src_gray, money, 1.1, 3, 0, cv::Size(10, 10),cv::Size(2000, 2000) );

also i think minSize parameter value is too small