
Indonesia  Stock  Exchange.  From  the  regression 
analysis obtained some conclusions. First, Monday's 
return is different from any  other day. Second,  the 
lowest return is concentrated in the second week at 
the  beginning  of  the  month.  Third,  the  negative 
return on Monday is affected  by the return  on  the 
previous  Friday.  Fourth,  the  emergence  of  the 
Monday effect is not the same  throughout the time 
of data observation (Azlina, 2009). 
In stock return there are significant difference of 
influence,  which  is  proved  by  previous  research 
conducted by (Iramani and Mahdi, 2006), (Widodo, 
2008), (Akbar, 2009), (Rita M. , 2009), (Ambarwati, 
2009),  (Maria  and  Syahyunan,  2013),  (Lutfiaji, 
2013), (Saputro, 2014) which found that trading day 
had  a  significant  effect  on  stock  return.  While 
research  conducted  by  (Prasetyo,  2006),  (Pratomo, 
2007),  (Arieyani,  2011),  (Wijaya dkk  2013)  found 
that  trading  days  have  no  relationship  to  stock 
returns. 
Then,  one  of  the  strategies  or  techniques 
commonly used by shareholders for decision-making 
in stock investments is the market anomaly, which is 
an unanticipated  event or  event  and  this  offers  the 
shareholder  an  opportunity  to  earn  an  abnormal 
share return (Kasdjan, Nazarudin, and Yusuf, 2017). 
This market anomalies include Seasonal Anomalies, 
Accounting Anomalies, Company Anomalies, Event 
Anomalies.  
In this  research  I  chose  Seasonal  Anomalies  as 
an research object because according to Trisnadi and 
Sedana  (2016),  the  market  anomaly  violates  the 
hypothesis  about  the  concept  of  capital  market 
efficiency that states investors can not expect price 
and return based on stock prices in the past caused 
by a  random return, but can be predicted based on 
the effect of certain calendars.  
While  seasonal  anomalies  is  a  seasonal  market 
which is seasonal, an anomaly that has the form of 
deviation  of  efficient  market  hypothesis.  Seasonal 
anomalies or calender effect itself intends a market 
anomaly or economic effect  that appears related  to 
the  calendar.  These  effects  include  different 
behaviors  of the  stock  market on  different  days of 
the week, different times of the month, and different 
time of year/season (Endarwati, 2017). 
In  general,  efficient  capital  market  situation 
shows  the  relationship  between  market  price  and 
market  form.  Later,  the  development  of  the 
company's  financial  theory  in  this  capital  market 
over  the  last  few  decades  has  been  growing  very 
rapidly.  Then  later  put  forward  the  proposed 
Efficient  Market  Hypothesis  or  better  known  as 
Efficient  Market  Hypothesis  which  may  be  one  of 
the most famous breakthroughs proposed by Eugene 
F. Fama in 1970 (Harijanto and Kurniawati, 2013). 
The  Efficient  Market  Hypothesis  states  that  an 
efficient market is a market where the prices of all 
securities traded  by investors have reflected all the 
information. This information means the information 
that  comes  from  the  past,  present,  or  information 
that is opinion or rational opinion circulating in the 
market  that  can  affect  the  price  movement 
(Tandelilin 2010). If a market is in an efficient state, 
then  the  existing  security  prices  should  move  at 
random  (Random  Walk)  and  unpredictable 
(Harijanto and Kurniawati, 2013). 
Many of the findings suggest empirical evidence 
that supports the concept of efficient capital markets. 
In it, the conclusions obtained for each study show 
varying  results  between  each  other  (Harijanto  and 
Kurniawati,  2013)In  his  research,  Dwi 
Cahyaningdyah  (2005)  found  the  phenomenon  of 
Day  of  the  Week  Effect  on  the  Jakarta  Stock 
Exchange,  with  the  lowest  return  occurred  on 
Monday  (Monday  Effect)  and  the  highest  return 
occurred on Friday (Weekend Effect). Then, Ricky 
Chee-Jiun  Chia  dkk  (2008),  also  found  the 
phenomenon of Day of the Week Effect in several 
Capital Market in Asian Region like Capital Market 
of  Taiwan,  Hong  Kong,  Singapore,  and  South 
Korea.  The  study  found  that  the  rate  of  return  for 
each  trading  day  differed  significantly,  including 
Monday's  tend  to  be  negative  and  Friday's  return 
which tended to be higher than in other days. 
Lutfur  Rahman  (2009)  who  conducted  the 
research  on  Dhaka  Stock  Exchange,  found  that 
trading day had a significant effect on stock return 
on Dhaka  Stock Exchange.  Rahman explained that 
the  schedule  of  news  announcements  related  to 
economic  conditions  affect  investors'  behavior  in 
conducting stock transactions, thus forming a daily 
pattern of stock returns.After that, there is a testing 
of  January  Effect  that  ever  done  by  Wing-Keung 
Wong,  et  al  (2006)  on  the  Singapore  Stock 
Exchange  for  the  purpose  of  re-examining  the 
existence  of  Calendar  Anomalies  in  the  Singapore 
Capital Market using the latest data divided into two 
sub-periods,  before  the  crisis  and  after  the  1997 
crisis. Through this research, it  was found  that  the 
anomaly  phenomenon  in  the  Singapore  Capital 
Market  increasingly  weakened  its  existence.  The 
study found that the January Effect phenomenon that 
was  positive  in  the  pre-crisis  period  turned  into  a 
negative value in the period after the crisis. 
The objectives of this research are to investigate 
the effect of  difference  of  return  that happened  on 
Day  of  the  Week,the  occurrence  of  Monday,  
SEABC 2018 - 4th Sriwijaya Economics, Accounting, and Business Conference
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