Why did my equity decreased after the weekend (with fixed spread 12)

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3
shujidan 2016.07.04 23:48
 

 Maybe this is a basic question but I can't figure this out

Why did my equity decreased more than usual from Friday 23:55  to Monday 00:00

Is there a commission I am being charged with? I am on Alpari demo server

2016.07.04 12:49:14.923 2015.01.05 00:05  macd EURUSD,M5: Bid1.192490 Ask1.192610 balance10000.63 L500 equity9848.030000 margin38.460400 freemargin9809.5696
2016.07.04 12:49:14.888 2015.01.05 00:00  macd EURUSD,M5: Bid1.194540 Ask1.194660 balance10000.63 L500 equity9880.830000 margin38.460400 freemargin9842.3696
2016.07.04 12:49:14.855 2015.01.02 23:55  macd EURUSD,M5: Bid1.200110 Ask1.200230 balance10000.63 L500 equity9971.230000 margin38.460400 freemargin9932.7696
2016.07.04 12:49:14.822 2015.01.02 23:50  macd EURUSD,M5: Bid1.200030 Ask1.200150 balance10000.63 L500 equity9969.950000 margin38.460400 freemargin9931.4896
...before

According to my C++ simulation the equity at 00:00 should have been 9882.11 instead of 9880.83

strategy tester is configured with a fixed spread of 12 pips on both

currently my formula for equity is balance + each order Bid-open price

...before
(test.cpp:65) equity+= -5.4 ( 1.20003 - 1.20543 )* 0.01 * 100000
(test.cpp:65) equity+= -4.26 ( 1.20003 - 1.20429 )* 0.01 * 100000
(test.cpp:65) equity+= -6.36 ( 1.20003 - 1.20321 )* 0.02 * 100000
(test.cpp:65) equity+= -8.43 ( 1.20003 - 1.20284 )* 0.03 * 100000
(test.cpp:65) equity+= -4.08 ( 1.20003 - 1.20105 )* 0.04 * 100000
(test.cpp:65) equity+= -2.15 ( 1.20003 - 1.20046 )* 0.05 * 100000
(test.cpp:69) total equity 9969.95
(strategy.h:68) 2015.01.02 23:50 Bid 1.20003 Ask 1.20015  balance 10000.63  equity 9969.95  margin 38.4604  freemargin 9931.4896
(test.cpp:65) equity+= -5.32 ( 1.20011 - 1.20543 )* 0.01 * 100000
(test.cpp:65) equity+= -4.18 ( 1.20011 - 1.20429 )* 0.01 * 100000
(test.cpp:65) equity+= -6.2 ( 1.20011 - 1.20321 )* 0.02 * 100000
(test.cpp:65) equity+= -8.19 ( 1.20011 - 1.20284 )* 0.03 * 100000
(test.cpp:65) equity+= -3.76 ( 1.20011 - 1.20105 )* 0.04 * 100000
(test.cpp:65) equity+= -1.75 ( 1.20011 - 1.20046 )* 0.05 * 100000
(test.cpp:69) total equity 9971.23
(strategy.h:68) 2015.01.02 23:55 Bid 1.20011 Ask 1.20023  balance 10000.63  equity 9971.23  margin 38.4604  freemargin 9932.7696
(test.cpp:65) equity+= -10.89 ( 1.19454 - 1.20543 )* 0.01 * 100000
(test.cpp:65) equity+= -9.75 ( 1.19454 - 1.20429 )* 0.01 * 100000
(test.cpp:65) equity+= -17.34 ( 1.19454 - 1.20321 )* 0.02 * 100000
(test.cpp:65) equity+= -24.9 ( 1.19454 - 1.20284 )* 0.03 * 100000
(test.cpp:65) equity+= -26.04 ( 1.19454 - 1.20105 )* 0.04 * 100000
(test.cpp:65) equity+= -29.6 ( 1.19454 - 1.20046 )* 0.05 * 100000
(test.cpp:69) total equity 9882.11
(strategy.h:68) 2015.01.05 00:00 Bid 1.19454 Ask 1.19466  balance 10000.63  equity 9882.11  margin 38.4604  freemargin 9843.6496
...equity is wrong from here
(test.cpp:65) equity+= -12.94 ( 1.19249 - 1.20543 )* 0.01 * 100000
(test.cpp:65) equity+= -11.8 ( 1.19249 - 1.20429 )* 0.01 * 100000
(test.cpp:65) equity+= -21.44 ( 1.19249 - 1.20321 )* 0.02 * 100000
(test.cpp:65) equity+= -31.05 ( 1.19249 - 1.20284 )* 0.03 * 100000
(test.cpp:65) equity+= -34.24 ( 1.19249 - 1.20105 )* 0.04 * 100000
(test.cpp:65) equity+= -39.85 ( 1.19249 - 1.20046 )* 0.05 * 100000
(test.cpp:69) total equity 9849.31
(strategy.h:68) 2015.01.05 00:05 Bid 1.19249 Ask 1.19261  balance 10000.63  equity 9849.31  margin 38.4604  freemargin 9810.8496
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1217
FMIC 2016.07.05 00:35 #
 

Besides prices that "gapped" down by at least 55 pips during the opening on Monday, you also have to consider the swap/roll-over costs: http://alpari.com/en/faq/trading_terms/overnight_swaps/

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3
shujidan 2016.07.05 03:39 #
 
Alright thank you FMIC, I was not aware of that type of commissions, I have only seen that happen on weekends maybe it's different on real money accounts.
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13004
WHRoeder 2016.07.06 14:32 #
 
Orders held over 5 PM NY time have swap. Some brokers don't use the OrderCommission and OrderSwap but instead have entries in history (e.g. FXCM.)
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